Show:
Addition
Subtraction
Addition regrouping
Subtraction regrouping
100

What is 10 + 11

21

100

What is 19 - 12

7

100

What is 321 + 97

418

100

524 - 329

195

200

What is 13 + 6

19

200

What is 5 - 4

1

200

What is 86 + 97

183

200

What is 321 - 74

247

300

What is 6 + 9

15

300

What is 13 - 6

7

300

What is 145 + 567

712

300

What is 42 - 37

5

400

What is 100 + 17

 117

400

What is 5 - 0

5

400

What is 24 + 49

73

400

What is 794 - 609

185

500

What is 0 + 12

12

500

What is 10 - 2

8

500

What is 278 + 679

957

500

What is 25 - 19

6