Rounding whole numbers and decimals Creator: Jamin Jones Class
CEP: 811 Date: October 29, 2012
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Objectives You will be able to 1.Understand place value up to
the tenths and hundredths 2.Round numbers to the nearest tenth and
hundredth Core standard:OBJ05CCMA07: Use place value understanding
to round decimals to any place. It is the common core curriculum
standard for 5 th grade students.
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Road Map Part One: Round numbers to the nearest tens Round
numbers to the nearest hundreds Part Two: Identify tenths place
Identify hundredths place Part Three: Round to the nearest tenths
place
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Key Vocabulary Round - To replace a number with a number that
tells about how many. About - Around or close to.
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Why do we round? 1.When we round, we change a number into
another number that it is close to. 2. Rounding numbers is a good
way to estimate about how much you have. Part 1
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Rounding rule 0 2345768910 1 When rounding we have to decide if
we are going to round up or down. Placement on a the number line
can helps us see where to round. 5 is in the middle of 0 and
10.
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Rounding rule 0 2345768910 1 5 and above give it a shove.
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Why do we round? 0 2345768910 1 4 or below leave it alone.
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Rules Look at the number before 4 and below leave it alone 5
and above give it a shove Make everything after it a zero
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2 Rounding to the Nearest Ten 6 Click on the number in the tens
place.
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Great Job!!! 26 ones tens
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ones tens Try again. Remember place value order. 3 5
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2 When rounding we look at the number before the 10. 6
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2 If it is 5 and above you give the tens place a shove. 6
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30 The 2 becomes a 3 and the 6 becomes a 0.
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26 rounds to 30
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Lets try another 32 Click on the number in the tens place.
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Great Job!!! 32 ones tens
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ones tens Try again. Remember place value order. 3 5
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Lets try another 32 The 2 is below 5. Is it going to shove the
3 or leave it alone? Shove Leave
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Great Job!!! 4 and below leave it alone
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Try again. Remember the rule. -5 and above give it a shove -4
and below leave it alone
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Lets try another 30 The 3 stays the same and the 2 becomes a
0.
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10 121314151716181920 11 Another way Picture the number on a
number line and look for the number it is closest to.
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10 121314151716181920 11 Another way If you were to find 17 on
a number line, would it be closer to 10 or 20? 10 20
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Try again. Remember the rule. 17 is 7 away from 10, but only 3
away from 20.
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Great Job!!! 17 is only 3 away from 20.
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53 Lets Practice 38 16 44 Rounds to 4030 60 50 10 20 50 40
or
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Great Job!!! 38 rounds up to 40
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Try again. Remember the rule. If the ones place is: -5 and
above give the tens a shove -4 and below leave the tens alone
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Great Job!!! 53 rounds down to 50
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Try again. Remember the rule. If the ones place is: -5 and
above give the tens a shove -4 and below leave the tens alone
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Great Job!!! 16 rounds up to 20.
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Try again. Remember the rule. If the ones place is: -5 and
above give the tens a shove -4 and below leave the tens alone
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Great Job!!! 44 rounds down to 40.
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Try again. Remember the rule. If the ones place is: -5 and
above give the tens a shove -4 and below leave the tens alone
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134 Rounding to the Nearest Hundred Which number is in the
hundreds place?
134 Rounding to the Nearest Hundred Use the first number to the
right of the hundreds place to decide if you round up or down.
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134 Rounding to the Nearest Hundred Is the 3 going to give the
hundreds column a shove or leave it alone? Shove Leave
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Try again. Remember the rule. If the ones place is: -5 and
above give the tens a shove -4 and below leave the tens alone
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Great Job!!! The one in 134 will be left alone.
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100 Rounding to the Nearest Hundred Everything else becomes a
zero. 134 rounds to 100
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100120130140 150170160180190200 110 Another way Picture a
number on the number line between 2 hundreds. Which is it closest
to?
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100120130140 150170160180190200 110 Another way Would 131 round
to 100 or 200? 100 200
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Try again. Remember the rule. If the ones place is: -5 and
above in the tens gives the hundreds a shove -4 and below in the
tens leave the hundreds alone
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Great Job!!! 174 will round up to 200.
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Lets practice 174 223 562 Rounds to 600500 300 200 100 or
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Great Job!!! 174 will round up to 200.
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Try again. Remember the rule. If the ones place is: -5 and
above give the hundreds a shove -4 and below leave the hundreds
alone
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Great Job!!! 223 will round down to 200.
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Great Job!!! 562 will round up to 600.
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Place Value Part two HundredsTensOnesDecimalTenthsHundredths
There is a pattern with place value that starts from the ones and
moves out.
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Place Value HundredsTensOnesDecimalTenthsHundredths Click on
the arrow to follow the pattern. You start in the ones and move
out.
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Place Value HundredsTensOnesDecimalTenthsHundredths Click on
the arrow to follow the pattern. Next comes the tenths on one
side.
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Place Value HundredsTensOnesDecimalTenthsHundredths Click on
the arrow to follow the pattern. And the tenths on the other
side.
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Place Value HundredsTensOnesDecimalTenthsHundredths Click on
the arrow to follow the pattern. Next comes hundreds.
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Place Value HundredsTensOnesDecimalTenthsHundredths And then
hundredths on the other side.
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Place Value HundredsTensOnesDecimalTenthsHundredths The major
difference between the two sides is that one side has a -th on the
end and is a smaller value.
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Recognizing tenths and hundreds 124.35 17.1 2.89 57.21
34.67
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Click on the number below that correctly answers the question
124.35 17.1 2.89 57.21 34.67 Find the numbers with a 6 in the
tenths.
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Try again. Remember the place value chart.
HundredsTensOnesDecimalTenthsHundredths
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Great Job!!! TensOnesDecimalTenthsHundredths 34.67
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Click on the number below that correctly answers the question
124.35 17.1 2.89 57.21 34.67 Find the numbers with a 1 in the
tenths.
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Try again. Remember the place value chart.
HundredsTensOnesDecimalTenthsHundredths
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Great Job!!! TensOnesDecimalTenths 17.1
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Click on the number below that correctly answers the question
124.35 17.1 2.89 57.21 34.67 Find the numbers with a 1 in the
hundredths.
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Try again. Remember the place value chart.
HundredsTensOnesDecimalTenthsHundredths
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Great Job!!! TensOnesDecimalTenthsHundredths 57.21
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Click on the number below that correctly answers the question
124.35 17.1 2.89 57.21 34.67 Find the numbers with a 5 in the
hundredths.
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Try again. Remember the place value chart.
HundredsTensOnesDecimalTenthsHundredths
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Great Job!!!. HundredsTensOnesDecimalTenthsHundredths
124.35
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Click on the number below that correctly answers the question
124.35 17.1 2.89 57.21 34.67 Find the numbers with a 8 in the
tenths.
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Try again. Remember the place value chart.
HundredsTensOnesDecimalTenthsHundredths
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Great Job! OnesDecimalTenthsHundredths 2.89
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Click on the number below that correctly answers the question
124.35 17.1 2.89 57.21 34.67 Find the numbers with a 7 in the
hundredths.
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Try again. Remember the place value chart.
HundredsTensOnesDecimalTenthsHundredths
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Great Job! OnesDecimalTenthsHundredths 2.89
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Rounding Numbers to the nearest tenth We learned before that
you round numbers to estimate how much we have. We can round
numbers to figure out approximately how much we owe for a
bill.
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Rounding Numbers to the nearest tenth When rounding to the
nearest tenth it is like rounding to the nearest 10 cents in money.
If you dont have exact change you can round to find how much you
will pay.
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Rounding Numbers to the nearest tenth How do we do this? Just
like with rounding to the nearest ten and hundred.
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Rounding Numbers to the nearest tenth Step 1: 1.Look at the
number to the right. 2.Is it a 5 and above or a 4 and below 3.Make
the change to the correct place 4.Everything else after the number
being changed becomes a zero
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Lets Try 125125.4545 Which number is in the tenths place?
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Try again. Remember the place value chart.
HundredsTensOnesDecimalTenthsHundredths
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Great Job!!! HundredsTensOnesDecimalTenthsHundredths
125.45
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125.45 Will the 4 be shoved up or left the same? Shove
Leave
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Try again. Remember the rule. -5 and above give it a shove -4
and below leave it alone
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Great Job!!! 4 and below leave it alone
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125.50 4 is shoved up to 5 and everything after it becomes a
zero.
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51.125112 Round to the nearest tenth. Which number is in the
tenths?
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Try again. Remember the rule. -5 and above give it a shove -4
and below leave it alone
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Great Job!!! TensOnesDecimalTenthsHundredths 51.12
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51.12 Will the one be left alone or give a shove? Shove
Leave
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Try again. Remember the rule. -5 and above give it a shove -4
and below leave it alone
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Great Job!!! 4 and below leave it alone
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Click on the number below that correctly rounds each number to
the nearest tenth. 124.35 17.12 34.67 Rounds to 34.6034.70 17.20
124.40 17.10 124.30 or
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Try again. Remember the rule. -5 and above give it a shove -4
and below leave it alone
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Great Job!!! 5 and above, give it a shove
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Great Job!!! 4 and below leave it alone
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Great Job!!! 5 and above give it a shove
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You have completed parts 1,2, and 3 of rounding whole numbers
and decimals.
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Credits Created by: Jamin Jones ClipArt: "2012 Jupiterimages
Corporation. All rights reserved. and Microsoft office Date
:10/29/2012