Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 11 · 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: 51 × 48 = 2445. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 50 × 71 = 3546. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 169 + 802 = 968. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 34 × 56 = 1904. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 752 + 743 = 1495. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 71 × 68 = 4833. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 462 + 818 = 1280. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 73 × 18 = 1309. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 54 × 97 = 5245. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 978 + 679 = 1659. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 128 + 614 = 750. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 14 × 56 = 786. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 30 × 94 = 2820. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 69 × 30 = 2070. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 96 × 95 = 9114. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 87 × 33 = 2869. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 864 + 915 = 1781. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 56 × 12 = 672. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 80 × 58 = 4640. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 40 × 83 = 3314. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 37 × 36 = 1332. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 766 + 825 = 1591. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 354 + 574 = 928. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 95 × 41 = 3895. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 59 × 94 = 5546. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 15 × 86 = 1290. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 31 × 76 = 2356. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 904 + 125 = 1031. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 61 × 36 = 2200. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 790 + 606 = 1391. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 194 + 242 = 436. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 59 × 31 = 1831. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 633 + 449 = 1082. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 247 + 668 = 919. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 592 + 541 = 1133. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 49 × 35 = 1715. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 56 × 30 = 1672. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 59 × 20 = 1183. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 89 × 49 = 4368. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 17 × 66 = 1125. Correct or wrong? (a) wrong (b) correct

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