80 + 9 =
89
100 + 10 =
110
35 + 5 =
40
1,000 + 1,000 =
2,000
What is this sign " + " ?
plus
60 + 20 =
80
300 - 50 =
250
99 - 9 =
90
24 + 2 =
26
40 - 30 =
10
What is this sign " - " ?
minus
What is this sign " = " ?
equals