Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 846 · 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: 31 × 58 = 1790. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 88 × 88 = 7744. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 88 × 31 = 2720. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 505 + 314 = 819. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 159 + 235 = 391. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 13 × 62 = 806. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 82 × 90 = 7380. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 98 × 48 = 4702. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 394 + 932 = 1333. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 17 × 40 = 680. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 27 × 28 = 756. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 15 × 13 = 202. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 83 × 39 = 3233. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 13 × 60 = 781. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 302 + 878 = 1175. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 48 × 69 = 3315. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 66 × 59 = 3889. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 32 × 33 = 1049. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 463 + 568 = 1031. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 714 + 127 = 841. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 21 × 69 = 1449. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 496 + 916 = 1418. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 63 × 58 = 3655. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 643 + 992 = 1630. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 265 + 514 = 779. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 14 × 75 = 1050. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 614 + 363 = 977. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 617 + 589 = 1206. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 170 + 716 = 886. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 452 + 965 = 1410. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 237 + 145 = 387. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 47 × 13 = 615. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 33 × 57 = 1879. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 38 × 90 = 3413. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 599 + 460 = 1059. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 65 × 82 = 5335. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 556 + 673 = 1229. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 14 × 75 = 1050. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 834 + 191 = 1021. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 484 + 340 = 820. Correct or wrong? (a) correct (b) wrong

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