Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 684 · 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: 223 + 215 = 440. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 35 × 89 = 3115. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 19 × 62 = 1178. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 41 × 92 = 3776. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 49 × 62 = 3038. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 23 × 58 = 1334. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 32 × 49 = 1573. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 598 + 476 = 1081. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 398 + 579 = 977. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 366 + 885 = 1259. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 946 + 167 = 1112. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 17 × 95 = 1611. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 49 × 98 = 4800. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 728 + 122 = 850. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 370 + 897 = 1272. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 60 × 70 = 4200. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 632 + 140 = 772. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 31 × 61 = 1891. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 725 + 747 = 1469. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 99 × 23 = 2277. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 53 × 32 = 1699. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 136 + 156 = 292. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 58 × 45 = 2610. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 35 × 13 = 455. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 18 × 19 = 342. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 810 + 655 = 1461. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 199 + 348 = 544. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 403 + 221 = 624. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 83 × 31 = 2573. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 77 × 95 = 7315. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 37 × 33 = 1221. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 817 + 973 = 1790. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 74 × 61 = 4518. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 124 + 330 = 454. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 76 × 23 = 1749. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 47 × 63 = 2961. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 269 + 998 = 1267. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 82 × 73 = 5986. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 176 + 137 = 311. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 986 + 898 = 1884. Correct or wrong? (a) wrong (b) correct

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