Kerjakan dengan teliti dan benar !
1. 12 + n = 56 n = ......
2. 34 + n = 78 n = ......
3. 56 + n = 109 n = .......
4. 67 - n = 23 n = ......
5. 117 - n = 87 n = ......
6. 78 - n = 50 n = ......
7. n + 45 = 67 n = ......
8. n + 16 = 90 n = ......
9. n - 59 = 78 n = ......
10. n - 81 = 23 n = .......
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