Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 168 · 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: 48 × 43 = 2060. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 87 × 41 = 3570. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 34 × 65 = 2216. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 569 + 615 = 1176. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 625 + 773 = 1393. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 45 × 53 = 2385. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 24 × 51 = 1225. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 20 × 25 = 501. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 313 + 919 = 1230. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 50 × 29 = 1453. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 936 + 251 = 1187. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 30 × 30 = 892. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 607 + 709 = 1311. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 313 + 693 = 1006. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 53 × 29 = 1538. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 84 × 15 = 1261. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 94 × 99 = 9306. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 466 + 668 = 1134. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 769 + 927 = 1703. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 935 + 605 = 1548. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 386 + 356 = 742. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 842 + 330 = 1177. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 267 + 254 = 521. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 30 × 92 = 2761. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 66 × 25 = 1651. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 75 × 20 = 1496. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 956 + 234 = 1189. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 58 × 29 = 1682. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 68 × 65 = 4424. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 407 + 401 = 803. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 866 + 841 = 1707. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 86 × 40 = 3444. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 759 + 348 = 1107. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 88 × 38 = 3344. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 98 × 19 = 1859. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 17 × 52 = 882. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 61 × 28 = 1708. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 98 × 82 = 8036. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 777 + 919 = 1690. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 601 + 692 = 1296. Correct or wrong? (a) wrong (b) correct

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