Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 516 · 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: 58 × 82 = 4763. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 219 + 418 = 637. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 88 × 86 = 7563. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 68 × 75 = 5104. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 209 + 314 = 523. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 973 + 311 = 1284. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 432 + 796 = 1228. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 836 + 214 = 1053. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 394 + 705 = 1098. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 227 + 181 = 406. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 95 × 23 = 2191. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 979 + 500 = 1477. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 60 × 59 = 3533. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 227 + 513 = 740. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 594 + 498 = 1092. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 18 × 29 = 522. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 61 × 91 = 5548. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 80 × 32 = 2560. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 176 + 856 = 1033. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 609 + 302 = 911. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 70 × 31 = 2170. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 63 × 17 = 1064. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 81 × 78 = 6313. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 99 × 33 = 3274. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 926 + 657 = 1577. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 14 × 40 = 560. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 876 + 897 = 1778. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 98 × 57 = 5587. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 795 + 465 = 1260. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 12 × 89 = 1068. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 43 × 48 = 2065. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 641 + 879 = 1520. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 665 + 126 = 784. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 86 × 35 = 3010. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 790 + 449 = 1233. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 897 + 131 = 1028. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 37 × 92 = 3404. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 224 + 306 = 530. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 43 × 66 = 2839. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 690 + 619 = 1309. Correct or wrong? (a) wrong (b) correct

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