Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 118 · 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: 504 + 759 = 1263. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 872 + 677 = 1549. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 82 × 59 = 4836. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 86 × 92 = 7909. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 350 + 423 = 773. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 777 + 354 = 1131. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 35 × 66 = 2310. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 72 × 53 = 3816. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 44 × 87 = 3832. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 166 + 999 = 1165. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 26 × 76 = 1976. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 82 × 62 = 5084. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 169 + 561 = 737. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 403 + 352 = 751. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 64 × 35 = 2240. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 66 × 20 = 1320. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 21 × 85 = 1785. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 448 + 347 = 789. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 745 + 354 = 1099. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 61 × 98 = 5981. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 34 × 26 = 884. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 247 + 921 = 1172. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 347 + 604 = 951. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 31 × 28 = 868. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 30 × 52 = 1560. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 453 + 136 = 596. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 120 + 482 = 602. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 914 + 403 = 1317. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 884 + 744 = 1628. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 29 × 39 = 1131. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 39 × 85 = 3316. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 53 × 91 = 4823. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 823 + 123 = 946. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 91 × 93 = 8455. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 524 + 209 = 735. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 310 + 607 = 917. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 54 × 48 = 2587. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 903 + 401 = 1304. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 94 × 89 = 8359. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 49 × 77 = 3773. Correct or wrong? (a) wrong (b) correct

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