Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 933 · 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: 81 × 35 = 2835. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 32 × 73 = 2337. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 24 × 33 = 795. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 93 × 14 = 1302. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 660 + 497 = 1165. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 21 × 99 = 2082. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 36 × 29 = 1044. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 373 + 955 = 1328. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 24 × 97 = 2334. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 988 + 369 = 1358. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 564 + 965 = 1529. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 396 + 743 = 1139. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 156 + 338 = 501. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 27 × 30 = 810. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 584 + 316 = 897. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 267 + 821 = 1088. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 66 × 45 = 2970. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 33 × 85 = 2805. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 435 + 132 = 567. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 463 + 580 = 1043. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 62 × 15 = 935. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 64 × 26 = 1665. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 70 × 91 = 6370. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 35 × 54 = 1890. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 770 + 267 = 1037. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 795 + 280 = 1078. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 44 × 89 = 3916. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 193 + 749 = 946. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 310 + 497 = 807. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 39 × 54 = 2106. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 63 × 20 = 1260. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 462 + 835 = 1296. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 504 + 429 = 925. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 65 × 60 = 3897. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 22 × 53 = 1166. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 480 + 689 = 1169. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 27 × 99 = 2674. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 70 × 84 = 5877. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 12 × 69 = 833. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 662 + 212 = 874. Correct or wrong? (a) wrong (b) correct

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