Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 38 · 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: 342 + 817 = 1158. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 823 + 496 = 1319. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 89 × 66 = 5878. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 565 + 752 = 1314. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 394 + 180 = 581. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 157 + 409 = 566. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 199 + 492 = 692. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 135 + 781 = 913. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 610 + 851 = 1456. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 84 × 46 = 3868. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 31 × 30 = 925. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 286 + 729 = 1017. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 77 × 46 = 3543. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 85 × 60 = 5100. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 728 + 253 = 977. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 94 × 51 = 4795. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 975 + 971 = 1939. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 296 + 852 = 1148. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 549 + 719 = 1268. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 30 × 98 = 2940. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 307 + 545 = 852. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 39 × 83 = 3240. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 12 × 18 = 216. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 86 × 30 = 2573. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 267 + 852 = 1116. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 73 × 65 = 4748. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 677 + 988 = 1664. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 36 × 64 = 2304. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 868 + 907 = 1780. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 55 × 62 = 3410. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 26 × 48 = 1248. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 45 × 36 = 1620. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 359 + 839 = 1198. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 37 × 89 = 3294. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 80 × 81 = 6475. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 457 + 997 = 1456. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 48 × 82 = 3936. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 36 × 29 = 1049. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 645 + 553 = 1198. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 17 × 55 = 935. Correct or wrong? (a) correct (b) wrong

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