Addition
12 + 14
10 + 10 =
20
34 - 11
30 - 10 =
20
78 - 49
80 - 50 =
30
99 - 12
100 - 10 =
90
376 + 302
400 + 300 =
700
329 - 29
330 - 30 =
300
982 + 876
1,000 + 900 =
1,900
853 - 94
900 - 100 =
800
2,045 + 3,899
2,000 + 4,000 =
6,000
1,389 - 412
1,400 - 400 =
1000