Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 254 · 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: 31 × 60 = 1854. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 32 × 15 = 479. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 24 × 17 = 414. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 411 + 623 = 1026. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 636 + 363 = 999. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 45 × 68 = 3060. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 20 × 92 = 1840. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 81 × 69 = 5594. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 54 × 90 = 4860. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 76 × 56 = 4254. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 17 × 43 = 731. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 29 × 46 = 1334. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 86 × 60 = 5160. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 22 × 77 = 1689. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 33 × 16 = 528. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 297 + 711 = 1013. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 54 × 46 = 2489. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 440 + 998 = 1430. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 428 + 791 = 1224. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 806 + 690 = 1503. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 381 + 469 = 850. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 15 × 93 = 1395. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 603 + 725 = 1328. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 78 × 85 = 6629. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 67 × 52 = 3489. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 17 × 20 = 348. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 13 × 50 = 650. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 45 × 14 = 631. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 61 × 85 = 5185. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 53 × 69 = 3650. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 73 × 26 = 1901. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 80 × 21 = 1680. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 562 + 849 = 1411. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 36 × 48 = 1728. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 41 × 57 = 2337. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 12 × 87 = 1050. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 780 + 330 = 1110. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 47 × 80 = 3760. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 61 × 27 = 1639. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 465 + 990 = 1454. Correct or wrong? (a) correct (b) wrong

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