Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 75 · 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: 69 × 23 = 1587. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 42 × 30 = 1265. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 819 + 348 = 1167. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 26 × 40 = 1040. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 357 + 259 = 616. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 546 + 857 = 1407. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 82 × 51 = 4182. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 668 + 172 = 842. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 31 × 90 = 2790. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 44 × 20 = 883. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 42 × 57 = 2394. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 507 + 142 = 652. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 94 × 24 = 2251. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 735 + 549 = 1284. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 64 × 45 = 2883. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 68 × 71 = 4821. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 552 + 320 = 871. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 57 × 66 = 3762. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 47 × 68 = 3199. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 179 + 490 = 669. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 70 × 23 = 1613. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 79 × 41 = 3239. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 58 × 88 = 5102. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 709 + 340 = 1049. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 78 × 37 = 2886. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 16 × 54 = 864. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 13 × 65 = 845. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 325 + 147 = 469. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 244 + 832 = 1076. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 28 × 70 = 1960. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 97 × 34 = 3298. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 639 + 189 = 834. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 84 × 14 = 1176. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 948 + 917 = 1865. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 442 + 552 = 994. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 26 × 46 = 1196. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 86 × 63 = 5418. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 38 × 33 = 1254. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 66 × 19 = 1252. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 50 × 62 = 3104. Correct or wrong? (a) wrong (b) correct

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