Notes Over 3 – 1 Round each number to the given place value.

1. Round 8.7398 to the nearest: 7a. tenth

8.7

Since the 3 in the hundredths place is lower than 5, the 7 in the tenths place stays a 7. Drop everything past the 7.

Notes Over 3 – 1 Round each number to the given place value.

1. Round 8.7398 to the nearest: 8a. tenth

8.7

Since the 3 in the hundredths place is lower than 5, the 7 in the tenths place stays a 7. Drop everything past the 7.

b. integer

9

Since the 7 in the tenths place is higher than 5, the 8 in the ones place becomes a 9. Drop everything past the decimal.

Notes Over 3 – 1 Round each number to the given place value.

2. Round 7,098.56 to the nearest: 0a. hundred

7,100

Since the 9 in the tens place is higher than 5, the 0 in the hundreds place becomes a 1.Everything behind the 1 becomes a 0 up to the decimal.

Notes Over 3 – 1 Round each number to the given place value.

2. Round 7,098.56 to the nearest:5a. hundred

7,100

Since the 9 in the tens place is higher than 5, the 0 in the hundreds place becomes a 1.Everything behind the 1 becomes a 0 up to the decimal.

b. tenth

7,098.6

Since the 6 in the hundredths place is higher than 5, the 5 in the tenths place becomes a 6. Drop everything past the 5.

Notes Over 3 – 1 3. Estimate by Rounding.

a. $4.89

$9$3.87

$5$4

b. 453.56

220230.07

450230

Notes Over 3 – 1 4. Estimate by Front-End Estimation.

a. 14.39

1379.102

49

b. 2.298

1.17.750

.3

.8

1780 = 93

279 = 10.1

Notes Over 3 – 1 5. Estimate by Clustering.

a. $4.50 + $5.20 + $5.55 Since all of them are close to $5, you can

multiply:

$5 X 3 = $15

b. 26.7 + 26.2 + 24.52 + 25.25 +23.9 Since all of them are close to 25, you can

multiply:

25 X 5 = 125

Notes Over 3 – 2 1. Estimate by Rounding.

6.43

4.76 5 = 30

Notes Over 3 – 2 2. Joshua bought 3 yards of fabric to make a dress. The fabric cost $5.65/yd. The clerk said his total was $14.95 before tax. Did the clerk make a mistake? Explain.

5.65

36 3 = 185 3 = 15

It should have cost between $15

and $18.

Notes Over 3 – 2 Estimate by using Compatible Numbers.

3. 38.9 1.7938 2 = 19

4. 82.52 4.25

84 4 = 21

Notes Over 3 – 2

30 6 = 55. Is 3.29 a reasonable quotient for

31.423 5.94? Explain.

It should have been closer to 5.

Page 125, 3 – 1 #1-13, 14-46 even

Page 129, 3 – 2 #1-8, 10-30 even