Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 666 · 40 questions

The fast method (Casting out nines): Find the nine-check number of each number: add the digits until one digit is left. Do the same sum (× or +) with those digits and shrink the result to one digit too. Shrink the given answer. Different → wrong. Same → it passes the check.

1. 1.Check with nines: 20 × 90 = 1800. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 55 × 58 = 3190. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 16 × 72 = 1152. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 13 × 85 = 1109. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 95 × 86 = 8170. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 451 + 193 = 642. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 360 + 456 = 824. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 698 + 634 = 1331. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 20 × 35 = 700. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 28 × 89 = 2492. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 27 × 52 = 1404. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 64 × 55 = 3528. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 690 + 328 = 1021. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 342 + 795 = 1137. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 20 × 61 = 1220. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 60 × 86 = 5160. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 616 + 262 = 875. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 30 × 12 = 361. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 52 × 24 = 1246. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 50 × 31 = 1542. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 500 + 327 = 827. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 15 × 87 = 1313. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 562 + 212 = 774. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 66 × 21 = 1386. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 47 × 94 = 4415. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 129 + 288 = 410. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 36 × 46 = 1664. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 99 × 62 = 6135. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 95 × 16 = 1525. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 94 × 83 = 7799. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 32 × 70 = 2240. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 32 × 75 = 2400. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 425 + 914 = 1339. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 47 × 88 = 4136. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 359 + 698 = 1059. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 39 × 20 = 785. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 202 + 851 = 1054. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 70 × 36 = 2520. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 14 × 81 = 1129. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 285 + 787 = 1067. Correct or wrong? (a) wrong (b) correct

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