Math Review: Topics 1-3

Adding Digits

100

34 + 78 = ?? 

112

200

198 + 55 = ??

253

300

499 + 175 = ??

674

400

1,072 + 481 = ??

1,553

500

2,361 + 59 = ??

2,420

Place Value

100

What digit is in the ones place? 

6,549

9

200

How many tens are in this number? 

589

8 tens

300

Write this number in expanded form.

4,578

4,000 + 500 +70 + 8

400

Write this number in standard form.

50,000 + 7,000 + 40 + 2

57,042

500

Write these numbers from least to greatest. 

414, 789, 798, 542, 404, 524

Least to Greatest

404, 414, 524, 542, 789, 798

Rounding

100

Round this number to the nearest 10.

46

50

200

Round this number to the nearest 100.

742

700

300

Round this number to the nearest 10.

888

890

400

Round this number to the nearest 100.

344

300

500

Round this number to the nearest 1,000.

4,398

4,000

Subtracting Digits

100

52 - 9 = ??

43

200

108 - 68 = ??

40

300

390 - 99 = ??

291

400

600 - 429 = ??

171

500

894 - 178 = ??

716

Estimating Sums & Differences

100

Estimate to find the sum. Round to the nearest 10.

44 + 78 =

40 + 80 = 120

200

Estimate to find the difference. Round to the nearest 10.

79 - 29 = ??

80 - 30 = 50

300

Estimate to find the sum. Round to the nearest 100.

451 + 389 = ??

500 + 400 = 900

400

Estimate to find the difference. Round to the nearest 100.

767 - 531 = ??

800 - 500 = 300

500

Estimate to find the difference. Round to the nearest 100.

777 + 231 = ??

800 + 200 = 1,000