Rounding & Estimating Whole Numbers and Decimals

Rounding Decimal Numbers

100

Round 2.33 to the nearest tenth?

2.3

200

Round 200.2378 to the nearest thousandth.

200.238

300

Round 234.93 to the nearest tenth.

234.90

400

Round 3.459 to the nearest hundredth.

3.46

500

Round 34.5697 to the nearest thousandth.

34.570

Rounding Whole Numbers

100

Round 423 to the nearest tens place.

420

200

Round 2,389 to the nearest hundreds place.

2,400

300

Round $11.56 to the nearest whole dollar.

$12

400

Round 12,439 to the nearest ten-thousands place.

10,000

500

Round 2,372,000,000 to the nearest hundred-millions place.

2,400,000,000

Estimate the SUM

100

25.4 + 19.6

Answers may vary. 50 or 45

200

$43.99 + 4.50

Answers may vary. Possible answers include: $49.00, $45.00, $48.50

300

$2.39 + 0.75

Answers may vary. Possible answers include: $3.00, $3.20, $3.40

400

456 + 23

Answers may vary. Possible answers include: 520 and 480

500

$24.90 + $10.01 + $4.99

Answers may vary. Possible answers include: $40.00, $35.00, $39.90

Estimate the Difference

100

20.4 - 15.5

Answers may vary. Possible answers include: 0 and 4

200

100.48 - 80.56

Answers may vary. Possible answers include: 20 and 19

300

1,243 - 456

Answers may vary. Possible answers include: 700, 780, 540, and 500

400

9,234 - 3,456

Answers may vary. Possible answers include: 6,000 & 5,700 & 5,770

500

13.6 - 8.9 - 0.9

Answers may vary. Possible answers include: 4 and 0

Review (DOUBLE POINTS)

100

3,205,814 What number is in the hundred-thousands place?

2

200

34.0981 What number is in the thousandths place?

8

300

7.025 ________ 7.0206 <, >, or =

>

400

Order the numbers from least to greatest. 5.285 ; 5.825 ; 5.5 ; 5.28 ; 5

5 5.28 5.285 5.5 5.825

500

Name the value of the digit in the hundredths place. Round this number to the nearest tens place. 48.12

Value = 0.02 Rounded number= 50.00