Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 935 · 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 × 39 = 1560. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 586 + 299 = 885. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 74 × 57 = 4220. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 975 + 717 = 1696. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 83 × 47 = 3901. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 405 + 495 = 900. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 56 × 71 = 3982. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 323 + 161 = 484. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 31 × 29 = 899. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 590 + 343 = 932. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 260 + 245 = 505. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 33 × 13 = 429. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 773 + 399 = 1164. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 63 × 20 = 1260. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 905 + 755 = 1660. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 173 + 930 = 1103. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 12 × 37 = 444. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 78 × 13 = 1014. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 857 + 217 = 1074. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 539 + 789 = 1334. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 773 + 280 = 1054. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 43 × 23 = 989. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 879 + 624 = 1503. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 892 + 819 = 1719. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 124 + 695 = 813. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 89 × 18 = 1602. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 69 × 83 = 5727. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 87 × 24 = 2088. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 819 + 579 = 1398. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 54 × 97 = 5238. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 34 × 83 = 2815. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 59 × 69 = 4071. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 985 + 800 = 1785. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 89 × 25 = 2223. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 28 × 50 = 1400. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 720 + 925 = 1645. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 27 × 32 = 861. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 317 + 941 = 1258. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 230 + 440 = 670. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 246 + 759 = 1005. Correct or wrong? (a) wrong (b) correct

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