Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 476 · 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: 25 × 39 = 975. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 148 + 221 = 369. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 85 × 29 = 2465. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 67 × 75 = 5025. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 90 × 72 = 6480. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 90 × 68 = 6120. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 328 + 369 = 701. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 81 × 18 = 1455. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 862 + 665 = 1522. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 84 × 36 = 3024. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 14 × 50 = 705. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 694 + 318 = 1012. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 20 × 28 = 567. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 965 + 352 = 1317. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 404 + 322 = 726. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 93 × 57 = 5306. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 429 + 255 = 684. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 25 × 26 = 647. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 905 + 471 = 1376. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 15 × 34 = 510. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 61 × 20 = 1220. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 729 + 394 = 1123. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 44 × 72 = 3170. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 394 + 639 = 1033. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 197 + 899 = 1096. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 73 × 83 = 6059. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 156 + 877 = 1037. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 78 × 35 = 2733. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 695 + 139 = 828. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 977 + 690 = 1672. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 72 × 96 = 6912. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 173 + 207 = 384. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 60 × 68 = 4080. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 52 × 64 = 3328. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 486 + 507 = 990. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 17 × 89 = 1509. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 365 + 793 = 1158. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 127 + 210 = 332. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 589 + 340 = 929. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 47 × 19 = 889. Correct or wrong? (a) correct (b) wrong

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