Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 60 · 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: 572 + 791 = 1363. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 89 × 27 = 2407. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 62 × 55 = 3415. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 56 × 82 = 4592. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 60 × 56 = 3360. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 134 + 796 = 930. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 461 + 475 = 936. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 85 × 57 = 4845. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 51 × 70 = 3562. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 235 + 755 = 990. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 955 + 295 = 1242. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 908 + 662 = 1578. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 59 × 44 = 2596. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 92 × 78 = 7184. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 93 × 68 = 6331. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 262 + 824 = 1086. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 28 × 20 = 560. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 324 + 840 = 1168. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 16 × 58 = 928. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 740 + 423 = 1163. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 276 + 551 = 825. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 37 × 33 = 1218. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 249 + 595 = 844. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 565 + 920 = 1485. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 531 + 751 = 1282. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 12 × 31 = 375. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 25 × 18 = 446. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 213 + 628 = 847. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 67 × 81 = 5427. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 231 + 518 = 754. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 162 + 564 = 726. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 16 × 34 = 539. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 80 × 18 = 1435. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 39 × 55 = 2145. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 333 + 138 = 471. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 25 × 80 = 2000. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 41 × 69 = 2834. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 93 × 26 = 2421. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 271 + 507 = 778. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 460 + 184 = 639. Correct or wrong? (a) correct (b) wrong

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