Show:
Mental Addition
Mental Subtraction
Column Addition
Column Subtraction
100

5 + 7

12

100

12 - 7

5

100

23 + 64 =

87

100

821 - 567 =

254

200

12 + 13

25

200

24 - 12

12

200

186 + 192 =

378

200

725 - 518=

207

300

18 + 22 + 5

45

300

79 - 23

56

300

234 + 121 + 100

455

300

615 - 183 =

432

400

30 + 5 + 7

42

400

81 - 34

47

400

89 + 198 =

287

400

200 - 70 - 30 =

100

500

234 + 234 + 110

378

500

225 - 42 - 120

63

500

10 + 12 + 25 + 40

87

500

930  - 75 - 30

825