Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 64 · 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: 348 + 360 = 708. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 654 + 429 = 1080. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 438 + 345 = 783. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 922 + 860 = 1782. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 52 × 67 = 3481. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 24 × 23 = 556. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 411 + 383 = 788. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 47 × 63 = 2969. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 13 × 80 = 1040. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 48 × 83 = 3984. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 382 + 385 = 767. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 49 × 50 = 2450. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 311 + 819 = 1131. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 56 × 67 = 3752. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 31 × 15 = 470. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 79 × 69 = 5451. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 139 + 890 = 1027. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 13 × 86 = 1118. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 95 × 58 = 5518. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 397 + 671 = 1067. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 30 × 24 = 720. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 91 × 94 = 8554. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 40 × 78 = 3121. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 297 + 413 = 707. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 16 × 80 = 1280. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 439 + 383 = 830. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 192 + 645 = 837. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 74 × 34 = 2517. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 568 + 279 = 847. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 194 + 594 = 789. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 96 × 91 = 8736. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 89 × 23 = 2043. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 237 + 881 = 1118. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 85 × 62 = 5270. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 243 + 905 = 1148. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 136 + 949 = 1084. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 67 × 84 = 5628. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 970 + 712 = 1689. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 99 × 23 = 2277. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 122 + 445 = 567. Correct or wrong? (a) wrong (b) correct

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