320 + 320 =
823- 523 =
20 X 8 =
120 + 120 + 120 + 120 =
625 + 125 =
400 + 400 - 20 =
30 + 30 + 30 + 30 + 30 =
1000 - 550 =
650 - 300 =
30 + 50 + 50 +50 + 50 + 20 =
200
480
350
250
780
160
640
450
750
150
