Addition
156+156
312
20-10
10
20+20+20
60
9+8
17
200+800
1,000
950-200
750
25+25+25
75
5+7
12
542+258
800
544-144
400
150+150+150
450
13+5
18
355+213
568
25-25
0
225+225+225+225
900
4+8
12
1,000+1,000
2,000
1,000-500
500
500+500+500
1,500
3+7
10