Challenging Addition
29 + 3
32
0-0
0
40 + 50
90
27-17
10
345+456
801
65 + 26
91
5 -1
4
37 + 20
57
100-50
1+1
2
1,000+1,000
2,000
7-3
4
17 + 31
48
78 - 28
50
5-6
negative 1
540 + 300
840
19 - 10
9
13 + 22
35
300 - 200
100
100-45
55
450 + 450
900
15-13
2
62 + 31
93
450 - 50
100+100-100
100