Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 650 · 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: 17 × 15 = 261. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 252 + 966 = 1218. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 373 + 695 = 1070. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 14 × 41 = 567. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 861 + 928 = 1791. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 790 + 685 = 1478. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 62 × 89 = 5525. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 41 × 48 = 1968. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 651 + 676 = 1327. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 155 + 135 = 290. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 698 + 688 = 1386. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 96 × 20 = 1913. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 36 × 27 = 968. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 36 × 72 = 2598. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 423 + 228 = 651. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 60 × 85 = 5100. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 86 × 71 = 6106. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 663 + 924 = 1587. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 72 × 56 = 4032. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 499 + 527 = 1024. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 374 + 411 = 782. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 451 + 793 = 1244. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 86 × 98 = 8428. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 808 + 222 = 1025. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 314 + 460 = 767. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 29 × 53 = 1537. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 99 × 91 = 9009. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 15 × 37 = 555. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 17 × 18 = 306. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 56 × 51 = 2862. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 99 × 79 = 7814. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 78 × 97 = 7566. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 855 + 542 = 1389. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 84 × 43 = 3612. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 702 + 908 = 1611. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 93 × 15 = 1395. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 875 + 726 = 1601. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 175 + 328 = 502. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 446 + 344 = 795. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 29 × 58 = 1682. Correct or wrong? (a) correct (b) wrong

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