Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 229 · 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: 455 + 139 = 600. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 804 + 497 = 1301. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 437 + 694 = 1131. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 46 × 45 = 2070. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 39 × 64 = 2489. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 28 × 14 = 385. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 361 + 335 = 696. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 29 × 64 = 1857. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 51 × 54 = 2754. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 753 + 170 = 923. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 39 × 30 = 1170. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 97 × 65 = 6302. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 43 × 88 = 3781. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 68 × 50 = 3398. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 436 + 319 = 757. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 482 + 880 = 1362. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 962 + 625 = 1587. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 39 × 73 = 2854. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 60 × 41 = 2460. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 654 + 235 = 886. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 54 × 30 = 1620. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 27 × 93 = 2511. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 85 × 43 = 3658. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 282 + 423 = 713. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 24 × 42 = 1008. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 997 + 615 = 1612. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 57 × 25 = 1433. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 54 × 57 = 3076. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 20 × 57 = 1137. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 80 × 83 = 6640. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 21 × 20 = 420. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 77 × 60 = 4620. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 86 × 62 = 5332. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 377 + 990 = 1367. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 32 × 23 = 736. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 883 + 679 = 1562. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 69 × 86 = 5935. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 35 × 46 = 1606. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 91 × 12 = 1093. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 253 + 422 = 679. Correct or wrong? (a) correct (b) wrong

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