Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 133 · 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: 839 + 159 = 1001. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 185 + 561 = 750. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 965 + 296 = 1261. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 269 + 569 = 840. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 273 + 769 = 1041. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 962 + 680 = 1636. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 787 + 616 = 1403. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 267 + 405 = 672. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 574 + 489 = 1063. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 52 × 49 = 2548. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 28 × 46 = 1288. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 14 × 84 = 1176. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 68 × 43 = 2923. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 69 × 28 = 1934. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 19 × 53 = 1010. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 253 + 998 = 1251. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 788 + 169 = 949. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 21 × 98 = 2058. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 56 × 64 = 3584. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 93 × 39 = 3630. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 123 + 793 = 918. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 820 + 822 = 1642. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 52 × 65 = 3380. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 76 × 58 = 4408. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 45 × 53 = 2385. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 125 + 454 = 586. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 324 + 217 = 537. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 29 × 98 = 2837. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 12 × 19 = 228. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 61 × 57 = 3477. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 365 + 221 = 589. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 95 × 16 = 1513. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 46 × 23 = 1054. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 46 × 49 = 2254. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 88 × 82 = 7213. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 917 + 601 = 1518. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 33 × 30 = 990. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 87 × 59 = 5126. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 62 × 99 = 6139. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 639 + 366 = 1005. Correct or wrong? (a) correct (b) wrong

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