addition 102
subtracton by 61
multiply by 9
1000

90+67

157

1000

1-1

0

1000

9x9

81

1000

30+30

60

1000

6-1

5

1000

1x9

9

1000

900+900

1'800

1000

10-10

0

1000

10x9

90

1108

89+89

178

1108

10-89

-79

1108

5x9

45

9051

60+60

120

9051

89-10

79

9051

9x10

10

M
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n
u