Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 172 · 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: 776 + 527 = 1303. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 12 × 23 = 281. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 46 × 23 = 1058. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 71 × 93 = 6603. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 31 × 46 = 1426. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 154 + 892 = 1038. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 41 × 80 = 3280. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 736 + 753 = 1481. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 87 × 66 = 5742. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 65 × 95 = 6168. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 26 × 76 = 1976. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 97 × 90 = 8725. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 45 × 71 = 3194. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 25 × 31 = 780. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 249 + 707 = 956. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 999 + 136 = 1135. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 74 × 42 = 3108. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 61 × 52 = 3170. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 60 × 79 = 4736. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 69 × 77 = 5320. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 363 + 538 = 894. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 279 + 519 = 803. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 321 + 830 = 1151. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 242 + 670 = 912. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 536 + 483 = 1023. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 30 × 35 = 1051. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 386 + 246 = 632. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 48 × 23 = 1104. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 457 + 353 = 810. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 19 × 82 = 1559. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 801 + 483 = 1284. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 944 + 952 = 1897. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 24 × 32 = 768. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 865 + 564 = 1429. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 34 × 63 = 2142. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 76 × 78 = 5936. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 598 + 908 = 1506. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 438 + 893 = 1331. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 803 + 597 = 1404. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 656 + 562 = 1221. Correct or wrong? (a) wrong (b) correct

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