Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 531 · 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: 32 × 81 = 2592. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 655 + 249 = 910. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 45 × 62 = 2785. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 65 × 58 = 3772. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 473 + 530 = 1003. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 41 × 20 = 826. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 203 + 437 = 640. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 51 × 79 = 4029. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 709 + 823 = 1524. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 76 × 69 = 5241. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 14 × 24 = 336. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 29 × 61 = 1769. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 347 + 983 = 1330. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 964 + 396 = 1368. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 579 + 839 = 1411. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 479 + 590 = 1069. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 44 × 46 = 2024. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 60 × 96 = 5761. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 31 × 73 = 2268. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 384 + 638 = 1021. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 43 × 31 = 1333. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 189 + 137 = 319. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 21 × 95 = 1995. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 46 × 38 = 1748. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 959 + 214 = 1173. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 85 × 54 = 4590. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 467 + 136 = 611. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 35 × 90 = 3150. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 52 × 80 = 4159. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 12 × 13 = 151. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 35 × 92 = 3216. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 851 + 364 = 1215. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 258 + 436 = 694. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 28 × 99 = 2768. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 848 + 982 = 1830. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 316 + 178 = 499. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 15 × 73 = 1095. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 551 + 557 = 1108. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 44 × 90 = 3964. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 73 × 71 = 5181. Correct or wrong? (a) correct (b) wrong

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