Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 842 · 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: 16 × 94 = 1502. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 144 + 631 = 775. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 48 × 31 = 1483. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 18 × 31 = 561. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 280 + 577 = 857. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 33 × 16 = 528. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 202 + 825 = 1027. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 764 + 987 = 1751. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 51 × 26 = 1326. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 93 × 81 = 7533. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 358 + 967 = 1328. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 18 × 81 = 1461. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 59 × 74 = 4366. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 41 × 20 = 826. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 74 × 18 = 1325. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 65 × 55 = 3571. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 54 × 40 = 2163. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 155 + 869 = 1024. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 59 × 28 = 1646. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 379 + 620 = 1001. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 457 + 725 = 1182. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 41 × 72 = 2952. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 42 × 47 = 1974. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 250 + 628 = 878. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 51 × 20 = 1020. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 58 × 36 = 2088. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 59 × 22 = 1296. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 17 × 33 = 556. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 126 + 599 = 725. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 46 × 93 = 4280. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 59 × 75 = 4425. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 39 × 41 = 1599. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 673 + 200 = 873. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 121 + 499 = 620. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 413 + 503 = 916. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 590 + 340 = 923. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 964 + 947 = 1911. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 26 × 78 = 2029. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 30 × 19 = 570. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 43 × 64 = 2745. Correct or wrong? (a) correct (b) wrong

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