Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 197 · 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: 700 + 871 = 1571. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 41 × 31 = 1278. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 682 + 149 = 831. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 377 + 223 = 604. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 66 × 33 = 2170. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 942 + 185 = 1124. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 23 × 69 = 1587. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 71 × 41 = 2906. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 92 × 26 = 2398. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 41 × 94 = 3854. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 66 × 27 = 1782. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 40 × 68 = 2720. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 97 × 42 = 4074. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 568 + 321 = 889. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 81 × 58 = 4698. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 614 + 836 = 1458. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 62 × 57 = 3534. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 83 × 23 = 1909. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 35 × 83 = 2905. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 76 × 32 = 2440. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 73 × 18 = 1314. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 975 + 386 = 1365. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 70 × 57 = 3988. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 715 + 233 = 944. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 28 × 42 = 1178. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 87 × 34 = 2958. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 625 + 548 = 1173. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 51 × 75 = 3821. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 40 × 24 = 960. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 36 × 69 = 2484. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 806 + 600 = 1399. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 43 × 58 = 2494. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 20 × 16 = 320. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 31 × 28 = 869. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 62 × 36 = 2232. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 44 × 84 = 3701. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 84 × 37 = 3108. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 89 × 96 = 8546. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 72 × 57 = 4100. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 835 + 426 = 1262. Correct or wrong? (a) correct (b) wrong

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