Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 836 · 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: 90 × 96 = 8640. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 65 × 84 = 5460. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 904 + 456 = 1352. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 287 + 739 = 1026. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 385 + 466 = 851. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 479 + 970 = 1449. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 58 × 15 = 870. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 18 × 17 = 309. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 46 × 63 = 2895. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 22 × 69 = 1518. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 228 + 974 = 1194. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 647 + 856 = 1510. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 30 × 30 = 900. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 47 × 21 = 987. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 23 × 37 = 851. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 56 × 73 = 4088. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 29 × 64 = 1856. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 81 × 49 = 3969. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 451 + 299 = 750. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 811 + 356 = 1167. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 31 × 55 = 1698. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 723 + 981 = 1704. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 81 × 59 = 4777. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 509 + 473 = 980. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 461 + 301 = 762. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 130 + 577 = 707. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 715 + 653 = 1368. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 51 × 22 = 1122. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 37 × 20 = 740. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 24 × 76 = 1824. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 982 + 828 = 1811. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 25 × 59 = 1476. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 677 + 277 = 961. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 15 × 81 = 1215. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 836 + 355 = 1198. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 639 + 361 = 998. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 889 + 612 = 1507. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 907 + 709 = 1616. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 859 + 693 = 1552. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 15 × 18 = 270. Correct or wrong? (a) correct (b) wrong

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