Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 284 · 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: 19 × 13 = 252. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 12 × 32 = 384. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 770 + 583 = 1357. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 91 × 67 = 6094. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 80 × 13 = 1038. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 917 + 835 = 1754. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 304 + 156 = 460. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 165 + 525 = 696. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 787 + 548 = 1332. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 16 × 67 = 1074. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 466 + 349 = 820. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 692 + 925 = 1617. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 57 × 21 = 1197. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 30 × 91 = 2730. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 97 × 32 = 3104. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 71 × 71 = 5044. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 49 × 69 = 3385. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 834 + 984 = 1818. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 73 × 31 = 2263. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 91 × 98 = 8923. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 44 × 98 = 4319. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 86 × 20 = 1720. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 25 × 12 = 299. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 610 + 477 = 1087. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 125 + 998 = 1123. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 426 + 375 = 801. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 27 × 46 = 1245. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 768 + 225 = 993. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 43 × 71 = 3053. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 235 + 748 = 983. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 364 + 276 = 640. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 156 + 794 = 942. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 64 × 31 = 1984. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 765 + 410 = 1177. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 607 + 446 = 1053. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 94 × 21 = 1982. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 511 + 727 = 1230. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 52 × 94 = 4888. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 37 × 76 = 2814. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 162 + 297 = 458. Correct or wrong? (a) wrong (b) correct

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