Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 795 · 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: 666 + 454 = 1114. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 68 × 47 = 3196. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 18 × 28 = 502. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 15 × 32 = 480. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 121 + 473 = 594. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 65 × 77 = 4997. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 84 × 65 = 5462. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 650 + 154 = 804. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 644 + 897 = 1548. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 73 × 50 = 3645. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 68 × 85 = 5772. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 88 × 54 = 4752. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 364 + 363 = 727. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 147 + 442 = 589. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 86 × 98 = 8428. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 726 + 582 = 1308. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 762 + 637 = 1407. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 562 + 226 = 787. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 57 × 30 = 1710. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 85 × 79 = 6711. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 47 × 22 = 1034. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 96 × 96 = 9216. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 986 + 235 = 1223. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 51 × 79 = 4029. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 829 + 462 = 1293. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 838 + 984 = 1825. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 134 + 269 = 403. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 585 + 382 = 961. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 73 × 19 = 1387. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 906 + 170 = 1076. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 88 × 97 = 8541. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 323 + 418 = 741. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 77 × 73 = 5621. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 130 + 970 = 1100. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 38 × 79 = 3002. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 50 × 13 = 650. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 53 × 83 = 4399. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 340 + 742 = 1082. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 429 + 403 = 825. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 66 × 31 = 2044. Correct or wrong? (a) wrong (b) correct

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