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Subtraction
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Add double
Three Adding
100

4+5=

9

100

10-5=

5

100

1x8=

8

100

10+20=

30

100

100+200=

300

200

10+5=

15

200

10-4=

6

200

1x3=

3

200

20+20=

40

200

100+400=

500

300

11+5=

16

300

16-10=

6

300

2x4=

8

300

30+30=

60

300

200+100=

300

400

100+20=

120

400

120-20=

100

400

2x5=

10

400

10+60=

70

400

300+200=

500

500

120+40=

160

500

130-30=

10

500

2x6=

12

500

10+80=

90

500

200+400=

600