Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 500 · 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: 45 × 15 = 678. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 29 × 41 = 1195. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 80 × 93 = 7437. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 122 + 435 = 564. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 53 × 27 = 1434. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 547 + 923 = 1469. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 52 × 23 = 1196. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 43 × 97 = 4171. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 85 × 75 = 6377. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 12 × 35 = 420. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 49 × 32 = 1568. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 54 × 48 = 2592. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 63 × 23 = 1449. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 97 × 32 = 3104. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 38 × 67 = 2546. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 32 × 21 = 672. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 825 + 357 = 1183. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 228 + 498 = 733. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 138 + 981 = 1115. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 493 + 230 = 720. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 380 + 968 = 1353. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 41 × 12 = 492. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 753 + 640 = 1401. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 481 + 126 = 612. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 513 + 515 = 1033. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 95 × 88 = 8360. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 976 + 700 = 1676. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 45 × 71 = 3195. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 44 × 55 = 2422. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 29 × 22 = 638. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 953 + 370 = 1323. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 368 + 208 = 581. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 178 + 924 = 1102. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 891 + 595 = 1486. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 52 × 89 = 4628. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 58 × 31 = 1790. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 61 × 87 = 5307. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 16 × 14 = 226. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 466 + 433 = 898. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 43 × 21 = 910. Correct or wrong? (a) correct (b) wrong

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