Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 521 · 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: 14 × 23 = 323. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 37 × 84 = 3102. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 620 + 831 = 1459. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 647 + 751 = 1398. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 50 × 24 = 1205. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 120 + 629 = 749. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 588 + 793 = 1373. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 39 × 24 = 933. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 333 + 135 = 468. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 36 × 65 = 2340. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 29 × 45 = 1305. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 61 × 85 = 5185. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 61 × 99 = 6034. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 27 × 76 = 2044. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 33 × 13 = 430. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 25 × 69 = 1725. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 540 + 223 = 763. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 66 × 56 = 3696. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 182 + 437 = 619. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 44 × 14 = 616. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 867 + 703 = 1565. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 989 + 931 = 1923. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 13 × 24 = 312. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 49 × 73 = 3580. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 48 × 15 = 719. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 24 × 45 = 1088. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 282 + 175 = 452. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 95 × 24 = 2281. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 71 × 60 = 4265. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 86 × 86 = 7398. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 388 + 944 = 1335. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 57 × 63 = 3596. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 274 + 253 = 527. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 850 + 947 = 1797. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 45 × 52 = 2340. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 73 × 81 = 5914. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 19 × 87 = 1653. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 732 + 228 = 966. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 68 × 60 = 4080. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 27 × 95 = 2564. Correct or wrong? (a) correct (b) wrong

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