Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 303 · 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: 89 × 58 = 5162. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 248 + 219 = 469. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 39 × 90 = 3510. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 511 + 634 = 1140. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 182 + 622 = 808. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 13 × 36 = 468. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 32 × 76 = 2435. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 36 × 70 = 2520. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 25 × 21 = 525. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 82 × 20 = 1648. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 30 × 58 = 1740. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 55 × 63 = 3465. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 24 × 44 = 1056. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 90 × 98 = 8813. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 62 × 79 = 4903. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 695 + 581 = 1284. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 41 × 73 = 2998. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 49 × 88 = 4312. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 29 × 14 = 408. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 663 + 549 = 1212. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 404 + 553 = 957. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 731 + 612 = 1342. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 65 × 15 = 975. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 721 + 921 = 1648. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 738 + 667 = 1405. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 71 × 48 = 3409. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 86 × 37 = 3182. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 87 × 86 = 7482. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 99 × 83 = 8211. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 61 × 44 = 2691. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 530 + 690 = 1220. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 29 × 52 = 1507. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 70 × 14 = 972. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 60 × 92 = 5516. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 47 × 24 = 1129. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 26 × 24 = 624. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 34 × 67 = 2278. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 46 × 21 = 966. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 636 + 945 = 1584. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 76 × 70 = 5325. Correct or wrong? (a) correct (b) wrong

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