Rounding whole numbers and decimals Creator: Jamin Jones Class
CEP: 811 Date: October 29, 2012
Slide 3
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.
Slide 4
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
Slide 5
Key Vocabulary Round - To replace a number with a number that
tells about how many. About - Around or close to.
Slide 6
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
Slide 7
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.
Slide 8
Rounding rule 0 2345768910 1 5 and above give it a shove.
Slide 9
Why do we round? 0 2345768910 1 4 or below leave it alone.
Slide 10
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
Slide 11
2 Rounding to the Nearest Ten 6 Click on the number in the tens
place.
Slide 12
Great Job!!! 26 ones tens
Slide 13
ones tens Try again. Remember place value order. 3 5
Slide 14
2 When rounding we look at the number before the 10. 6
Slide 15
2 If it is 5 and above you give the tens place a shove. 6
Slide 16
30 The 2 becomes a 3 and the 6 becomes a 0.
Slide 17
26 rounds to 30
Slide 18
Lets try another 32 Click on the number in the tens place.
Slide 19
Great Job!!! 32 ones tens
Slide 20
ones tens Try again. Remember place value order. 3 5
Slide 21
Lets try another 32 The 2 is below 5. Is it going to shove the
3 or leave it alone? Shove Leave
Slide 22
Great Job!!! 4 and below leave it alone
Slide 23
Try again. Remember the rule. -5 and above give it a shove -4
and below leave it alone
Slide 24
Lets try another 30 The 3 stays the same and the 2 becomes a
0.
Slide 25
10 121314151716181920 11 Another way Picture the number on a
number line and look for the number it is closest to.
Slide 26
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
Slide 27
Try again. Remember the rule. 17 is 7 away from 10, but only 3
away from 20.
Slide 28
Great Job!!! 17 is only 3 away from 20.
Slide 29
53 Lets Practice 38 16 44 Rounds to 4030 60 50 10 20 50 40
or
Slide 30
Great Job!!! 38 rounds up to 40
Slide 31
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
Slide 32
Great Job!!! 53 rounds down to 50
Slide 33
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
Slide 34
Great Job!!! 16 rounds up to 20.
Slide 35
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
Slide 36
Great Job!!! 44 rounds down to 40.
Slide 37
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
Slide 38
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.
Slide 42
134 Rounding to the Nearest Hundred Is the 3 going to give the
hundreds column a shove or leave it alone? Shove Leave
Slide 43
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
Slide 44
Great Job!!! The one in 134 will be left alone.
Slide 45
100 Rounding to the Nearest Hundred Everything else becomes a
zero. 134 rounds to 100
Slide 46
100120130140 150170160180190200 110 Another way Picture a
number on the number line between 2 hundreds. Which is it closest
to?
Slide 47
100120130140 150170160180190200 110 Another way Would 131 round
to 100 or 200? 100 200
Slide 48
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
Slide 49
Great Job!!! 174 will round up to 200.
Slide 50
Lets practice 174 223 562 Rounds to 600500 300 200 100 or
Slide 51
Great Job!!! 174 will round up to 200.
Slide 52
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
Slide 53
Great Job!!! 223 will round down to 200.
Slide 54
Great Job!!! 562 will round up to 600.
Slide 55
Place Value Part two HundredsTensOnesDecimalTenthsHundredths
There is a pattern with place value that starts from the ones and
moves out.
Slide 56
Place Value HundredsTensOnesDecimalTenthsHundredths Click on
the arrow to follow the pattern. You start in the ones and move
out.
Slide 57
Place Value HundredsTensOnesDecimalTenthsHundredths Click on
the arrow to follow the pattern. Next comes the tenths on one
side.
Slide 58
Place Value HundredsTensOnesDecimalTenthsHundredths Click on
the arrow to follow the pattern. And the tenths on the other
side.
Slide 59
Place Value HundredsTensOnesDecimalTenthsHundredths Click on
the arrow to follow the pattern. Next comes hundreds.
Slide 60
Place Value HundredsTensOnesDecimalTenthsHundredths And then
hundredths on the other side.
Slide 61
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.
Slide 62
Recognizing tenths and hundreds 124.35 17.1 2.89 57.21
34.67
Slide 63
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.
Slide 64
Try again. Remember the place value chart.
HundredsTensOnesDecimalTenthsHundredths
Slide 65
Great Job!!! TensOnesDecimalTenthsHundredths 34.67
Slide 66
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.
Slide 67
Try again. Remember the place value chart.
HundredsTensOnesDecimalTenthsHundredths
Slide 68
Great Job!!! TensOnesDecimalTenths 17.1
Slide 69
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.
Slide 70
Try again. Remember the place value chart.
HundredsTensOnesDecimalTenthsHundredths
Slide 71
Great Job!!! TensOnesDecimalTenthsHundredths 57.21
Slide 72
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.
Slide 73
Try again. Remember the place value chart.
HundredsTensOnesDecimalTenthsHundredths
Slide 74
Great Job!!!. HundredsTensOnesDecimalTenthsHundredths
124.35
Slide 75
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.
Slide 76
Try again. Remember the place value chart.
HundredsTensOnesDecimalTenthsHundredths
Slide 77
Great Job! OnesDecimalTenthsHundredths 2.89
Slide 78
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.
Slide 79
Try again. Remember the place value chart.
HundredsTensOnesDecimalTenthsHundredths
Slide 80
Great Job! OnesDecimalTenthsHundredths 2.89
Slide 81
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.
Slide 82
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.
Slide 83
Rounding Numbers to the nearest tenth How do we do this? Just
like with rounding to the nearest ten and hundred.
Slide 84
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
Slide 85
Lets Try 125125.4545 Which number is in the tenths place?
Slide 86
Try again. Remember the place value chart.
HundredsTensOnesDecimalTenthsHundredths
Slide 87
Great Job!!! HundredsTensOnesDecimalTenthsHundredths
125.45
Slide 88
125.45 Will the 4 be shoved up or left the same? Shove
Leave
Slide 89
Try again. Remember the rule. -5 and above give it a shove -4
and below leave it alone
Slide 90
Great Job!!! 4 and below leave it alone
Slide 91
125.50 4 is shoved up to 5 and everything after it becomes a
zero.
Slide 92
51.125112 Round to the nearest tenth. Which number is in the
tenths?
Slide 93
Try again. Remember the rule. -5 and above give it a shove -4
and below leave it alone
Slide 94
Great Job!!! TensOnesDecimalTenthsHundredths 51.12
Slide 95
51.12 Will the one be left alone or give a shove? Shove
Leave
Slide 96
Try again. Remember the rule. -5 and above give it a shove -4
and below leave it alone
Slide 97
Great Job!!! 4 and below leave it alone
Slide 98
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
Slide 99
Try again. Remember the rule. -5 and above give it a shove -4
and below leave it alone
Slide 100
Great Job!!! 5 and above, give it a shove
Slide 101
Great Job!!! 4 and below leave it alone
Slide 102
Great Job!!! 5 and above give it a shove
Slide 103
You have completed parts 1,2, and 3 of rounding whole numbers
and decimals.
Slide 104
Credits Created by: Jamin Jones ClipArt: "2012 Jupiterimages
Corporation. All rights reserved. and Microsoft office Date
:10/29/2012
