Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 199 · 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: 941 + 578 = 1519. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 98 × 70 = 6860. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 74 × 87 = 6438. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 45 × 47 = 2114. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 84 × 84 = 7056. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 254 + 682 = 936. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 135 + 464 = 601. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 42 × 39 = 1642. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 518 + 197 = 715. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 66 × 94 = 6196. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 963 + 719 = 1682. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 87 × 37 = 3219. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 67 × 70 = 4690. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 847 + 271 = 1118. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 884 + 589 = 1473. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 25 × 22 = 550. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 23 × 13 = 299. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 235 + 199 = 434. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 848 + 432 = 1280. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 14 × 55 = 770. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 487 + 821 = 1313. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 63 × 77 = 4851. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 54 × 23 = 1240. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 23 × 86 = 1978. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 719 + 187 = 906. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 625 + 921 = 1546. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 86 × 86 = 7396. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 14 × 92 = 1288. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 225 + 738 = 957. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 149 + 569 = 718. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 694 + 746 = 1445. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 169 + 463 = 628. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 91 × 83 = 7553. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 95 × 45 = 4270. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 836 + 972 = 1808. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 173 + 976 = 1149. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 47 × 79 = 3713. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 67 × 99 = 6633. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 26 × 32 = 834. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 89 × 97 = 8633. Correct or wrong? (a) wrong (b) correct

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