ALTA Math

3

10

20

50

100

1,000

1,000,000

100,
000,000,
000,000

+

+1

+11

+▦

99
     +
99

+

game

-

-1

-11

99
     -
99

-

game

X1

X10

X▦

99
     x
99

÷1

÷10