Show:
adding
time tables
subtracting
100

1+1

what is 2

100

10 times 10

what is 100

100

10 subtract 10

what is 0

200

10+10

what is 20

200

100 times 100

what is 10000 

200

80 subtract 10

what is 70

300

20+20

what is 40

300

200 times 200

what is 40000 

300

100 subtract 99

what is 1

400

40+40

what is 80

400

1000 times 1000

1000000 


400

5000 subtract 4000

what is 1000

500

1000+1000

what is 2000

500

0 times 0

what is 0
500

10000 subtract 0

what is 10000