Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 281 · 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: 20 × 89 = 1780. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 86 × 58 = 4988. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 17 × 94 = 1598. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 19 × 12 = 220. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 497 + 243 = 740. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 605 + 152 = 757. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 62 × 73 = 4527. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 301 + 926 = 1231. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 40 × 15 = 596. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 15 × 27 = 400. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 984 + 642 = 1622. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 21 × 72 = 1506. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 45 × 92 = 4134. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 670 + 292 = 962. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 24 × 82 = 1968. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 71 × 45 = 3195. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 34 × 96 = 3264. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 80 × 24 = 1912. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 370 + 254 = 624. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 388 + 913 = 1294. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 34 × 37 = 1266. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 92 × 84 = 7722. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 23 × 42 = 961. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 722 + 292 = 1014. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 96 × 50 = 4800. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 530 + 463 = 993. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 682 + 171 = 854. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 304 + 989 = 1294. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 248 + 139 = 384. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 55 × 61 = 3353. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 21 × 76 = 1602. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 270 + 159 = 429. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 388 + 306 = 694. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 778 + 451 = 1229. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 165 + 379 = 545. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 473 + 699 = 1172. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 173 + 323 = 496. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 80 × 67 = 5353. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 19 × 22 = 418. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 165 + 682 = 847. Correct or wrong? (a) wrong (b) correct

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