Addition
Subtraction
Extreme Math
Extreme Subtraction
100
10+20
What is 30
100
9-9
What is 0
100
45+28
What is 73
100
78-69
What is 9
200
18+8
What is 26
200
24-18
What is 6
200
35+78
What is 113
200
90-78

What is 12


300
15+9
What is 24
300
2 -1
What is 1
300
23+98
What is 121
300
89-78
What is 21
400
14+0

What is 14


400
35-9
What is 26
400
89 +90
What is 179
400
112-89
What is 23
500
20+67
What is 87
500
45-5
What is 40
500
79+278
What is 357
500
120 -110
What is 10
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