Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 767 · 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 × 27 = 432. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 978 + 417 = 1397. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 205 + 708 = 918. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 29 × 35 = 1015. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 122 + 133 = 260. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 51 × 99 = 5050. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 194 + 424 = 610. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 791 + 211 = 1001. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 67 × 16 = 1072. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 455 + 940 = 1395. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 54 × 89 = 4806. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 15 × 75 = 1121. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 158 + 630 = 788. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 12 × 30 = 353. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 69 × 85 = 5871. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 43 × 77 = 3303. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 84 × 58 = 4870. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 93 × 98 = 9111. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 50 × 16 = 800. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 179 + 988 = 1167. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 175 + 824 = 994. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 465 + 710 = 1175. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 927 + 539 = 1467. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 939 + 302 = 1241. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 681 + 371 = 1056. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 180 + 242 = 425. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 876 + 823 = 1701. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 89 × 60 = 5335. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 71 × 58 = 4118. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 460 + 135 = 590. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 874 + 220 = 1094. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 253 + 127 = 382. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 86 × 69 = 5934. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 720 + 318 = 1038. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 61 × 88 = 5368. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 232 + 278 = 510. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 169 + 310 = 474. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 54 × 97 = 5238. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 642 + 682 = 1330. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 34 × 16 = 548. Correct or wrong? (a) wrong (b) correct

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