Level 1
What is 8 - 2 =
6
What is 6 - 1 =
5
What is 1000 - 500 =
500
2
What is 100 x 10 =
1000
What is 64 - 1 + 3 =
66
What is 1 - 0 =
1
What is 99 - 10 =
89
What is 9999 - 9000 =
999
What is 8 - 1 =
7
What is 5 - 1 =
What is 9 + 10 =
19