Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 707 · 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: 43 × 43 = 1855. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 46 × 51 = 2343. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 284 + 214 = 502. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 238 + 688 = 924. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 38 × 17 = 646. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 799 + 463 = 1263. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 694 + 450 = 1152. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 75 × 77 = 5777. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 84 × 52 = 4366. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 47 × 52 = 2444. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 12 × 89 = 1068. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 35 × 99 = 3465. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 54 × 69 = 3728. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 64 × 37 = 2369. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 38 × 41 = 1550. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 53 × 74 = 3922. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 370 + 735 = 1112. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 30 × 38 = 1140. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 615 + 365 = 980. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 620 + 550 = 1170. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 49 × 67 = 3282. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 604 + 724 = 1334. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 133 + 161 = 286. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 28 × 24 = 672. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 844 + 867 = 1711. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 651 + 726 = 1377. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 24 × 49 = 1173. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 29 × 95 = 2755. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 19 × 44 = 836. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 467 + 247 = 720. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 238 + 766 = 1004. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 300 + 989 = 1289. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 52 × 71 = 3692. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 94 × 51 = 4794. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 964 + 795 = 1759. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 752 + 241 = 993. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 75 × 97 = 7275. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 856 + 286 = 1142. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 97 × 39 = 3787. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 17 × 72 = 1224. Correct or wrong? (a) wrong (b) correct

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