Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 598 · 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: 593 + 667 = 1261. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 38 × 54 = 2052. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 694 + 453 = 1141. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 14 × 89 = 1246. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 664 + 924 = 1594. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 45 × 18 = 810. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 37 × 62 = 2294. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 30 × 64 = 1916. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 387 + 204 = 591. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 632 + 895 = 1535. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 39 × 27 = 1059. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 330 + 485 = 821. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 874 + 672 = 1554. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 57 × 93 = 5304. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 481 + 562 = 1043. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 19 × 60 = 1140. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 409 + 736 = 1145. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 72 × 98 = 7056. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 38 × 22 = 836. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 24 × 70 = 1680. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 52 × 14 = 728. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 78 × 22 = 1712. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 630 + 340 = 970. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 463 + 260 = 723. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 20 × 77 = 1545. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 61 × 64 = 3906. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 211 + 427 = 638. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 91 × 35 = 3185. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 57 × 24 = 1368. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 417 + 886 = 1303. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 425 + 322 = 745. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 17 × 22 = 378. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 914 + 822 = 1736. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 25 × 16 = 397. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 919 + 741 = 1662. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 351 + 894 = 1245. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 26 × 18 = 461. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 74 × 20 = 1480. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 434 + 626 = 1060. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 870 + 178 = 1042. Correct or wrong? (a) wrong (b) correct

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