Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 976 · 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: 762 + 454 = 1216. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 451 + 856 = 1301. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 38 × 60 = 2280. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 71 × 33 = 2343. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 630 + 893 = 1523. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 889 + 455 = 1344. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 937 + 589 = 1526. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 15 × 85 = 1276. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 42 × 63 = 2646. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 25 × 36 = 900. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 74 × 56 = 4143. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 94 × 87 = 8178. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 57 × 91 = 5187. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 321 + 651 = 972. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 479 + 459 = 938. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 474 + 585 = 1064. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 93 × 29 = 2697. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 935 + 358 = 1300. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 725 + 805 = 1530. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 98 × 20 = 1960. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 70 × 19 = 1334. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 990 + 756 = 1746. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 839 + 401 = 1241. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 844 + 193 = 1031. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 23 × 67 = 1544. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 768 + 761 = 1532. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 89 × 45 = 4008. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 31 × 40 = 1244. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 295 + 386 = 681. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 197 + 598 = 798. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 78 × 75 = 5842. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 26 × 22 = 572. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 702 + 313 = 1015. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 404 + 719 = 1123. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 66 × 41 = 2706. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 786 + 975 = 1766. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 404 + 887 = 1291. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 175 + 816 = 991. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 684 + 841 = 1525. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 176 + 284 = 460. Correct or wrong? (a) correct (b) wrong

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