Show:
Adding-1
Adding
subtraction-1
subtraction
multiplication
50

4+5=

9
50

3+5=

8

50

12-10=

2
50

12-8=

4

50

1x7=

7

100

23+7=

30

100

20+15=

35

100

100-70=

30

100

150-100=

50

100

3x15=

45

150

21+19=

40

150

12+30=

42

150

90-15=

75

150

70-50=

20

150

9x3=

27

200

46+16

62

200

120+42=

162

200

45-10=

35

200

405-197=

208

200

7x12=

84

250

83+78=

161

250

270+30=

300

250

289-76=

213

250

1,897- 365=

1532

250

5x24=

120