Easy addition
20+20
40
0-0
0
427+572
999
27-17
10
345+456
801
800+456
1,256
20-10
2,000+444
2,444
100-57
43
1+1
2
1,000+1,000
2,000
256-133
123
498+427
925
1,000-567
433
5-6
negative 1
4,356+987
5,343
567-491
76
2,593+4,791
7,384
937-472
465
100-45
55
100,000+100,000
200,000
1,627-547
1,080
100,000+127,479
227,479
472-127
345
100+100-100
100