Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 852 · 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: 87 × 64 = 5564. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 82 × 86 = 7057. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 909 + 286 = 1194. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 137 + 822 = 959. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 55 × 23 = 1273. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 65 × 91 = 5915. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 19 × 43 = 817. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 777 + 332 = 1109. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 891 + 807 = 1694. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 926 + 703 = 1629. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 68 × 39 = 2653. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 392 + 339 = 735. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 614 + 443 = 1052. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 483 + 771 = 1254. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 70 × 80 = 5600. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 71 × 41 = 2911. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 560 + 147 = 707. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 21 × 62 = 1296. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 15 × 71 = 1065. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 554 + 159 = 713. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 34 × 25 = 850. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 29 × 83 = 2407. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 12 × 69 = 836. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 78 × 49 = 3814. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 31 × 46 = 1426. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 35 × 38 = 1335. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 668 + 375 = 1035. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 58 × 79 = 4582. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 894 + 211 = 1105. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 235 + 861 = 1096. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 91 × 31 = 2821. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 176 + 336 = 512. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 59 × 16 = 945. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 599 + 850 = 1447. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 298 + 673 = 979. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 527 + 752 = 1287. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 83 × 76 = 6312. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 89 × 88 = 7835. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 94 × 75 = 7043. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 26 × 38 = 988. Correct or wrong? (a) correct (b) wrong

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