Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 541 · 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: 22 × 21 = 463. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 47 × 58 = 2726. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 608 + 283 = 892. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 779 + 430 = 1209. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 453 + 610 = 1059. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 25 × 45 = 1125. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 507 + 568 = 1082. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 88 × 28 = 2464. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 432 + 727 = 1167. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 219 + 483 = 706. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 28 × 51 = 1428. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 89 × 66 = 5873. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 84 × 45 = 3782. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 683 + 638 = 1321. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 13 × 13 = 169. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 569 + 948 = 1517. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 35 × 74 = 2596. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 605 + 624 = 1229. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 30 × 97 = 2914. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 127 + 977 = 1104. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 43 × 75 = 3225. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 40 × 73 = 2920. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 241 + 276 = 518. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 32 × 31 = 992. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 64 × 67 = 4289. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 556 + 375 = 926. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 526 + 712 = 1238. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 88 × 99 = 8708. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 937 + 169 = 1106. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 93 × 76 = 7068. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 58 × 77 = 4466. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 48 × 89 = 4265. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 563 + 393 = 956. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 435 + 654 = 1081. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 959 + 307 = 1266. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 495 + 418 = 913. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 617 + 774 = 1384. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 74 × 49 = 3628. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 122 + 488 = 610. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 178 + 676 = 862. Correct or wrong? (a) wrong (b) correct

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