Subtraction
15-5=
15-5=10
5x5=
5x5=25
10/5=
10/5=2
5+5=
5+5=10
20-10=
20-10=10
5x5=
5x5=25
20/10=
20/10=2
21+3=
21+3=24
30-20=
30-20=10
20x5=
20x5=100
12/4=
12/4=3
10+20=
10+20=30
50-20=
50-20=30
30x5=
30x5=150
15/3=
15/3=5
10+30=
10+30=40
30-5=
30-5=25
50x5=
50x5=250
500/10=
500/10=50
1,000+4,000=
1,000+4,000=5,000