Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 781 · 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: 51 × 44 = 2244. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 64 × 35 = 2240. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 38 × 28 = 1072. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 21 × 53 = 1113. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 242 + 885 = 1127. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 451 + 833 = 1286. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 92 × 67 = 6164. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 35 × 22 = 763. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 40 × 19 = 760. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 879 + 509 = 1388. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 62 × 28 = 1736. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 589 + 974 = 1563. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 840 + 230 = 1070. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 728 + 282 = 1012. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 809 + 593 = 1402. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 23 × 85 = 1955. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 499 + 175 = 673. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 432 + 968 = 1404. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 903 + 635 = 1538. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 343 + 150 = 493. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 245 + 149 = 399. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 559 + 887 = 1440. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 22 × 95 = 2090. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 546 + 956 = 1505. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 48 × 18 = 864. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 765 + 653 = 1418. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 93 × 60 = 5588. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 584 + 229 = 813. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 311 + 219 = 530. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 159 + 371 = 530. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 286 + 560 = 846. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 628 + 447 = 1075. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 791 + 132 = 924. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 86 × 99 = 8514. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 820 + 568 = 1388. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 262 + 603 = 865. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 51 × 46 = 2350. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 469 + 381 = 845. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 309 + 701 = 1006. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 54 × 56 = 3024. Correct or wrong? (a) wrong (b) correct

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