Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 681 · 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: 44 × 71 = 3124. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 62 × 68 = 4222. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 853 + 309 = 1162. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 928 + 360 = 1288. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 70 × 12 = 840. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 77 × 35 = 2698. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 97 × 84 = 8142. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 64 × 80 = 5119. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 167 + 729 = 904. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 441 + 663 = 1104. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 913 + 678 = 1587. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 239 + 566 = 805. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 161 + 564 = 725. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 765 + 420 = 1180. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 64 × 67 = 4287. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 875 + 737 = 1618. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 399 + 157 = 562. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 896 + 806 = 1705. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 783 + 777 = 1553. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 89 × 60 = 5340. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 819 + 785 = 1604. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 704 + 436 = 1140. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 696 + 737 = 1430. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 31 × 23 = 721. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 41 × 24 = 984. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 395 + 512 = 907. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 59 × 72 = 4248. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 29 × 41 = 1192. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 47 × 43 = 2015. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 82 × 84 = 6882. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 957 + 368 = 1319. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 87 × 98 = 8526. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 49 × 16 = 784. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 31 × 91 = 2821. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 689 + 907 = 1596. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 60 × 38 = 2279. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 21 × 66 = 1386. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 92 × 12 = 1104. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 729 + 247 = 974. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 989 + 830 = 1819. Correct or wrong? (a) correct (b) wrong

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