Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 631 · 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: 744 + 390 = 1132. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 97 × 48 = 4655. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 972 + 357 = 1327. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 91 × 99 = 9009. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 95 × 84 = 7980. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 316 + 190 = 506. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 865 + 160 = 1032. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 950 + 149 = 1102. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 26 × 49 = 1268. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 14 × 41 = 574. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 647 + 470 = 1117. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 33 × 22 = 726. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 87 × 24 = 2088. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 516 + 469 = 989. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 16 × 56 = 896. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 98 × 29 = 2847. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 87 × 22 = 1914. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 329 + 781 = 1110. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 17 × 37 = 629. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 449 + 835 = 1284. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 83 × 33 = 2739. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 32 × 88 = 2816. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 704 + 710 = 1410. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 51 × 95 = 4843. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 42 × 25 = 1042. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 71 × 67 = 4757. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 80 × 74 = 5920. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 22 × 27 = 586. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 31 × 82 = 2536. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 52 × 68 = 3543. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 93 × 85 = 7899. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 15 × 87 = 1313. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 66 × 26 = 1716. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 974 + 355 = 1333. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 569 + 684 = 1248. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 73 × 91 = 6649. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 49 × 98 = 4802. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 548 + 312 = 860. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 69 × 52 = 3588. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 88 × 51 = 4495. Correct or wrong? (a) wrong (b) correct

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