Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 200 · 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: 16 × 21 = 336. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 44 × 18 = 792. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 689 + 212 = 896. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 59 × 93 = 5486. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 82 × 35 = 2875. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 30 × 44 = 1320. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 42 × 12 = 496. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 23 × 89 = 2047. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 740 + 754 = 1494. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 863 + 557 = 1414. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 136 + 731 = 874. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 368 + 425 = 800. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 20 × 78 = 1555. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 30 × 51 = 1530. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 62 × 53 = 3286. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 695 + 233 = 927. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 38 × 94 = 3574. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 934 + 588 = 1522. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 83 × 98 = 8134. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 24 × 13 = 314. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 53 × 74 = 3922. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 41 × 90 = 3690. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 473 + 758 = 1231. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 26 × 54 = 1410. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 13 × 35 = 455. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 333 + 689 = 1022. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 420 + 525 = 949. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 683 + 558 = 1241. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 35 × 73 = 2563. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 162 + 658 = 815. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 41 × 16 = 654. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 39 × 77 = 3007. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 20 × 57 = 1140. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 43 × 48 = 2069. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 96 × 55 = 5280. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 79 × 14 = 1106. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 596 + 569 = 1163. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 604 + 402 = 1014. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 30 × 46 = 1385. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 812 + 220 = 1032. Correct or wrong? (a) wrong (b) correct

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