Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 651 · 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: 95 × 55 = 5225. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 322 + 361 = 675. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 91 × 95 = 8645. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 74 × 48 = 3552. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 25 × 31 = 779. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 75 × 56 = 4201. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 77 × 43 = 3305. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 667 + 152 = 819. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 36 × 59 = 2124. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 312 + 130 = 446. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 52 × 35 = 1813. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 58 × 23 = 1341. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 198 + 906 = 1104. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 16 × 27 = 435. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 536 + 660 = 1200. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 62 × 85 = 5275. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 694 + 285 = 979. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 866 + 153 = 1019. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 69 × 33 = 2280. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 189 + 629 = 818. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 29 × 27 = 790. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 62 × 96 = 5944. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 759 + 199 = 961. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 534 + 694 = 1235. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 122 + 664 = 786. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 25 × 23 = 575. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 79 × 17 = 1337. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 17 × 24 = 408. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 41 × 70 = 2877. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 125 + 132 = 257. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 61 × 47 = 2863. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 935 + 696 = 1631. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 22 × 97 = 2127. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 59 × 94 = 5545. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 96 × 63 = 6056. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 93 × 61 = 5673. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 534 + 352 = 886. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 978 + 315 = 1297. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 67 × 29 = 1943. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 36 × 68 = 2448. Correct or wrong? (a) wrong (b) correct

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