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addition
Subtraction
repeated addition
easy multiplication
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100

1+1=

2

100

1-1=

0

100

1+2+1=

4

100

2x1=

2

100

1+1+1+1+1=

5

200

20+35

55

200

60-20

40

200

20+9+1

30

200

3x2

6

200

20+20+20+20+20

100

300

300+24

324

300

50-25

25

300

25+25+25 

75

300

50x2

100

300

10+20+10+20

60

400

12+19

31

400

99-87

12

400

40+40+40

120

400

12x2

24

400

30+50+30+50

160

500

75+75

150

500

112-111

1

500

1+1+1+1+1+5

10

500

9x3

27

500

500x2

10000