Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 630 · 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: 279 + 198 = 478. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 90 × 78 = 7021. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 893 + 894 = 1787. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 546 + 423 = 969. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 384 + 698 = 1082. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 17 × 99 = 1688. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 319 + 811 = 1124. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 243 + 299 = 542. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 687 + 321 = 1008. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 45 × 61 = 2744. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 26 × 70 = 1820. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 909 + 922 = 1834. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 55 × 93 = 5115. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 54 × 41 = 2211. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 52 × 68 = 3536. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 19 × 20 = 379. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 227 + 965 = 1185. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 98 × 19 = 1862. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 85 × 57 = 4851. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 951 + 419 = 1370. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 72 × 48 = 3456. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 51 × 42 = 2136. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 24 × 25 = 597. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 21 × 52 = 1092. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 43 × 30 = 1290. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 28 × 29 = 812. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 72 × 31 = 2235. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 71 × 92 = 6528. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 24 × 44 = 1056. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 28 × 49 = 1375. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 124 + 165 = 296. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 45 × 59 = 2655. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 83 × 20 = 1660. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 810 + 624 = 1442. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 12 × 80 = 960. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 93 × 81 = 7526. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 65 × 50 = 3250. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 59 × 20 = 1183. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 257 + 414 = 670. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 16 × 84 = 1352. Correct or wrong? (a) correct (b) wrong

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