Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 384 · 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: 722 + 317 = 1045. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 132 + 784 = 916. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 63 × 97 = 6111. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 64 × 27 = 1722. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 15 × 19 = 285. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 21 × 13 = 273. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 83 × 85 = 7055. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 179 + 737 = 919. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 68 × 60 = 4083. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 920 + 477 = 1404. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 29 × 27 = 784. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 31 × 16 = 492. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 19 × 75 = 1418. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 76 × 58 = 4408. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 66 × 18 = 1182. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 37 × 58 = 2154. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 749 + 718 = 1467. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 164 + 685 = 849. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 752 + 129 = 881. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 26 × 78 = 2028. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 86 × 94 = 8084. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 693 + 357 = 1050. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 38 × 24 = 912. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 623 + 739 = 1359. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 99 × 28 = 2775. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 941 + 913 = 1854. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 31 × 88 = 2735. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 561 + 928 = 1482. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 178 + 714 = 892. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 12 × 95 = 1138. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 56 × 13 = 728. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 43 × 80 = 3440. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 284 + 377 = 661. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 290 + 410 = 700. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 22 × 37 = 814. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 98 × 36 = 3528. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 412 + 611 = 1024. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 794 + 722 = 1521. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 551 + 470 = 1017. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 460 + 195 = 655. Correct or wrong? (a) wrong (b) correct

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