Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 478 · 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: 70 × 24 = 1674. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 965 + 200 = 1171. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 487 + 353 = 840. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 29 × 86 = 2493. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 38 × 63 = 2398. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 80 × 52 = 4160. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 76 × 31 = 2356. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 95 × 26 = 2463. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 491 + 711 = 1201. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 334 + 175 = 509. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 644 + 556 = 1200. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 16 × 36 = 579. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 38 × 64 = 2428. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 684 + 413 = 1104. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 98 × 23 = 2254. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 351 + 792 = 1143. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 248 + 217 = 465. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 90 × 30 = 2700. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 333 + 149 = 482. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 86 × 67 = 5762. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 62 × 64 = 3967. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 24 × 31 = 752. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 268 + 611 = 875. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 48 × 79 = 3799. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 649 + 154 = 803. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 64 × 19 = 1208. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 71 × 23 = 1641. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 75 × 39 = 2925. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 69 × 23 = 1582. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 74 × 24 = 1776. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 95 × 63 = 5985. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 98 × 82 = 8043. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 31 × 28 = 868. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 379 + 228 = 607. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 836 + 222 = 1058. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 58 × 96 = 5573. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 453 + 647 = 1100. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 14 × 63 = 882. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 99 × 83 = 8212. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 73 × 82 = 5988. Correct or wrong? (a) wrong (b) correct

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