Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 735 · 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: 17 × 16 = 274. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 175 + 666 = 843. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 39 × 24 = 936. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 363 + 974 = 1337. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 75 × 46 = 3451. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 968 + 496 = 1462. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 60 × 13 = 780. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 63 × 76 = 4787. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 91 × 63 = 5737. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 66 × 14 = 926. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 216 + 429 = 645. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 543 + 881 = 1423. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 25 × 34 = 850. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 94 × 45 = 4230. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 630 + 941 = 1571. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 894 + 563 = 1457. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 143 + 406 = 549. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 20 × 71 = 1420. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 437 + 253 = 690. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 864 + 888 = 1750. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 54 × 65 = 3510. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 30 × 66 = 1976. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 29 × 53 = 1539. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 89 × 90 = 8010. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 858 + 542 = 1393. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 747 + 800 = 1547. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 69 × 66 = 4559. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 97 × 61 = 5919. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 53 × 51 = 2704. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 889 + 404 = 1293. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 91 × 72 = 6552. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 70 × 45 = 3150. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 324 + 528 = 858. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 140 + 430 = 570. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 868 + 196 = 1064. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 331 + 122 = 450. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 57 × 76 = 4329. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 57 × 77 = 4389. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 32 × 41 = 1310. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 81 × 54 = 4374. Correct or wrong? (a) wrong (b) correct

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