Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 713 · 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: 70 × 21 = 1470. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 24 × 27 = 647. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 13 × 41 = 533. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 37 × 25 = 925. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 979 + 826 = 1805. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 368 + 135 = 511. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 690 + 630 = 1320. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 24 × 28 = 672. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 89 × 31 = 2759. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 17 × 28 = 475. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 970 + 600 = 1574. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 638 + 237 = 875. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 23 × 15 = 345. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 995 + 277 = 1275. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 414 + 794 = 1208. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 80 × 36 = 2880. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 691 + 177 = 862. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 177 + 701 = 878. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 31 × 19 = 594. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 20 × 51 = 1026. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 98 × 56 = 5488. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 78 × 42 = 3283. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 236 + 229 = 465. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 41 × 49 = 2009. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 62 × 26 = 1612. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 42 × 19 = 798. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 24 × 64 = 1536. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 382 + 709 = 1093. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 35 × 32 = 1122. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 216 + 289 = 505. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 673 + 261 = 934. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 261 + 487 = 748. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 651 + 817 = 1468. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 18 × 62 = 1116. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 236 + 278 = 518. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 374 + 592 = 965. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 97 × 23 = 2238. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 51 × 59 = 3010. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 56 × 27 = 1512. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 818 + 724 = 1538. Correct or wrong? (a) correct (b) wrong

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