Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 675 · 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: 185 + 770 = 961. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 252 + 126 = 378. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 80 × 73 = 5838. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 792 + 975 = 1767. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 80 × 57 = 4567. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 87 × 63 = 5481. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 27 × 22 = 594. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 330 + 342 = 672. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 852 + 290 = 1146. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 428 + 620 = 1048. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 632 + 618 = 1246. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 12 × 73 = 876. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 931 + 779 = 1717. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 86 × 61 = 5246. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 76 × 29 = 2212. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 79 × 50 = 3955. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 21 × 46 = 966. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 712 + 999 = 1711. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 625 + 948 = 1573. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 211 + 470 = 681. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 75 × 49 = 3675. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 54 × 61 = 3294. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 66 × 68 = 4488. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 421 + 540 = 953. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 28 × 12 = 341. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 27 × 78 = 2106. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 12 × 29 = 346. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 666 + 844 = 1513. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 85 × 25 = 2133. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 48 × 44 = 2117. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 45 × 97 = 4365. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 917 + 789 = 1712. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 62 × 75 = 4642. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 387 + 329 = 723. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 258 + 565 = 826. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 14 × 82 = 1148. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 494 + 583 = 1077. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 94 × 32 = 3016. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 13 × 13 = 168. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 84 × 14 = 1174. Correct or wrong? (a) correct (b) wrong

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