Show:
Estimating Addition
Addition
Estimating Subtraction
Subtraction
3/4 Digit Addition & Subtraction
100

24 + 13 (rounding to nearest tens)

20 + 10

100

25 + 10

35

100

36 - 14 (rounding to nearest tens)

40 - 10

100
20 - 10
10
100
100 + 200
300
200

19 + 32 (rounding to nearest tens)

20 + 30

200

26 + 31

57

200

87 - 44 (rounding to nearest tens)

90 - 40

200

41 - 28

13

200
126 + 345
471
300

150 + 87 (rounding to nearest hundreds)

200 + 100

300

127 + 94

221
300

536 - 98 (rounding to nearest hundreds)

500 - 100

300

245 - 235

10

300
700 - 300
400
400

822 + 637 (rounding nearest hundreds)

800 + 600

400

257 + 731

988

400

655 - 299 (rounding to nearest hundereds)

700 - 300

400

956 - 724

232

400
978 - 486
492
500

1629 + 7347 (rounding to nearest thousands)

2000 + 7000

500

1358 + 6322

7680

500

7809 - 4737 (rounding to nearest thousands)

8000 - 5000

500

6339 - 5796

543

500

7546 + 9743

17289