Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 596 · 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: 40 × 16 = 640. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 898 + 901 = 1799. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 420 + 351 = 771. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 947 + 459 = 1410. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 783 + 693 = 1476. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 519 + 273 = 792. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 56 × 48 = 2688. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 286 + 162 = 448. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 59 × 62 = 3661. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 953 + 597 = 1554. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 79 × 22 = 1738. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 17 × 26 = 442. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 31 × 56 = 1736. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 37 × 58 = 2145. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 37 × 66 = 2448. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 931 + 181 = 1112. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 68 × 84 = 5712. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 68 × 99 = 6732. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 79 × 41 = 3245. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 232 + 641 = 873. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 70 × 87 = 6090. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 861 + 544 = 1401. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 98 × 52 = 5101. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 47 × 26 = 1214. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 674 + 517 = 1191. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 56 × 88 = 4931. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 321 + 295 = 616. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 636 + 237 = 878. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 862 + 916 = 1778. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 162 + 639 = 801. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 57 × 71 = 4048. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 30 × 54 = 1620. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 62 × 64 = 3966. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 16 × 98 = 1568. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 860 + 156 = 1021. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 551 + 684 = 1235. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 643 + 164 = 805. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 32 × 15 = 476. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 22 × 62 = 1366. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 18 × 43 = 769. Correct or wrong? (a) wrong (b) correct

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