Easy addition
A little harder
Difficult addition
100
2+1=
3
100
3+5=
8
100
7+4=
11
200
2+3=
5
200
5+1=
6
200
4+2+1=
7
300
1+3=
4
300
4+5=
9
300
6+6=
12
400
1+1=
2
400
4+6=
10
400
2+2+1=
5
500
3+1=
4
500
4+2=
6
500
5+6=
11
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M
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