| 5 + 3 = 3 + 0 = 4 + 7 = 0 + 5 = 7 + 2 – 4 = | 3 + 5 – 8 =
+ 0 = 6 + 7 = 20 15 + = 15 0 + = 20 |
| 5 + 3 = 3 + 0 = 4 + 7 = 0 + 5 = 7 + 2 – 4 = | 3 + 5 – 8 =
+ 0 = 6 + 7 = 20 15 + = 15 0 + = 20 |