Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 716 · 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: 667 + 909 = 1582. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 162 + 684 = 846. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 988 + 307 = 1295. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 76 × 16 = 1221. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 503 + 316 = 819. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 913 + 756 = 1669. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 86 × 62 = 5332. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 58 × 79 = 4582. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 211 + 141 = 355. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 742 + 274 = 1016. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 757 + 307 = 1064. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 760 + 126 = 883. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 62 × 33 = 2048. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 315 + 388 = 703. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 27 × 26 = 702. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 99 × 27 = 2673. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 267 + 842 = 1109. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 970 + 440 = 1411. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 92 × 90 = 8280. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 86 × 42 = 3612. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 56 × 82 = 4592. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 23 × 68 = 1564. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 582 + 582 = 1157. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 38 × 41 = 1551. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 29 × 85 = 2471. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 88 × 87 = 7656. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 19 × 81 = 1539. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 449 + 643 = 1098. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 256 + 835 = 1097. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 60 × 25 = 1493. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 79 × 96 = 7584. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 52 × 12 = 624. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 984 + 901 = 1885. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 136 + 238 = 376. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 68 × 85 = 5776. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 375 + 125 = 494. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 740 + 828 = 1568. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 358 + 857 = 1215. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 66 × 34 = 2244. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 519 + 506 = 1028. Correct or wrong? (a) correct (b) wrong

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