Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 814 · 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: 41 × 76 = 3124. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 299 + 841 = 1140. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 94 × 12 = 1128. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 95 × 53 = 5035. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 671 + 214 = 885. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 508 + 261 = 765. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 258 + 258 = 518. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 25 × 16 = 400. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 932 + 240 = 1172. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 89 × 77 = 6851. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 62 × 18 = 1116. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 267 + 263 = 534. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 63 × 74 = 4664. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 999 + 503 = 1509. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 96 × 54 = 5185. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 43 × 35 = 1505. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 12 × 87 = 1052. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 58 × 59 = 3428. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 66 × 73 = 4818. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 414 + 441 = 854. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 61 × 31 = 1891. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 497 + 322 = 821. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 20 × 66 = 1319. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 66 × 72 = 4752. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 31 × 30 = 927. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 86 × 34 = 2924. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 798 + 980 = 1778. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 654 + 277 = 931. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 37 × 65 = 2405. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 613 + 718 = 1331. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 85 × 83 = 7049. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 627 + 185 = 812. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 78 × 22 = 1711. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 32 × 48 = 1536. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 77 × 34 = 2618. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 61 × 80 = 4880. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 297 + 174 = 471. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 68 × 67 = 4556. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 956 + 665 = 1629. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 320 + 524 = 844. Correct or wrong? (a) correct (b) wrong

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