Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 940 · 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: 134 + 719 = 860. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 552 + 210 = 762. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 487 + 349 = 835. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 316 + 264 = 580. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 68 × 13 = 880. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 80 × 79 = 6324. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 591 + 583 = 1174. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 87 × 94 = 8178. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 339 + 702 = 1041. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 45 × 82 = 3686. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 259 + 724 = 983. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 90 × 33 = 2976. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 779 + 376 = 1155. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 29 × 97 = 2813. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 58 × 49 = 2842. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 71 × 24 = 1704. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 423 + 372 = 795. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 30 × 98 = 2940. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 626 + 627 = 1253. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 40 × 84 = 3360. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 249 + 571 = 820. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 228 + 422 = 650. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 372 + 697 = 1068. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 138 + 748 = 886. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 601 + 512 = 1113. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 13 × 41 = 539. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 83 × 27 = 2240. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 48 × 36 = 1728. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 133 + 367 = 500. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 237 + 233 = 462. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 140 + 583 = 723. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 97 × 98 = 9505. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 569 + 198 = 768. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 544 + 320 = 864. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 64 × 50 = 3200. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 16 × 15 = 240. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 469 + 501 = 970. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 99 × 56 = 5545. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 13 × 71 = 927. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 820 + 221 = 1038. Correct or wrong? (a) wrong (b) correct

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