Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 970 · 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: 152 + 273 = 431. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 463 + 136 = 596. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 515 + 906 = 1421. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 786 + 472 = 1266. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 75 × 98 = 7351. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 251 + 471 = 719. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 89 × 55 = 4895. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 68 × 13 = 892. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 40 × 80 = 3200. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 45 × 98 = 4404. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 20 × 57 = 1140. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 985 + 275 = 1262. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 326 + 742 = 1073. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 37 × 69 = 2546. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 50 × 63 = 3150. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 47 × 67 = 3149. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 424 + 365 = 794. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 28 × 41 = 1148. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 603 + 817 = 1420. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 438 + 966 = 1408. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 92 × 20 = 1841. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 418 + 270 = 688. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 23 × 57 = 1310. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 57 × 65 = 3699. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 61 × 22 = 1336. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 545 + 687 = 1232. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 61 × 91 = 5554. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 191 + 891 = 1082. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 716 + 136 = 853. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 339 + 986 = 1325. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 55 × 51 = 2807. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 32 × 65 = 2080. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 846 + 779 = 1627. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 85 × 74 = 6287. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 501 + 877 = 1378. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 75 × 62 = 4650. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 29 × 67 = 1948. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 49 × 99 = 4851. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 52 × 45 = 2346. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 50 × 21 = 1050. Correct or wrong? (a) correct (b) wrong

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