Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 377 · 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: 42 × 92 = 3861. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 747 + 870 = 1618. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 77 × 21 = 1621. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 38 × 27 = 1026. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 85 × 35 = 2975. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 27 × 56 = 1512. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 364 + 577 = 941. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 297 + 543 = 840. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 44 × 34 = 1497. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 545 + 560 = 1111. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 30 × 42 = 1260. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 867 + 686 = 1553. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 58 × 99 = 5742. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 18 × 44 = 792. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 36 × 41 = 1476. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 49 × 60 = 2934. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 86 × 62 = 5332. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 88 × 69 = 6072. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 28 × 45 = 1260. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 564 + 140 = 704. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 74 × 28 = 2072. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 20 × 19 = 376. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 71 × 34 = 2407. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 545 + 316 = 854. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 142 + 138 = 274. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 14 × 33 = 462. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 127 + 207 = 335. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 310 + 344 = 658. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 421 + 160 = 584. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 57 × 23 = 1308. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 586 + 922 = 1516. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 804 + 541 = 1345. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 89 × 17 = 1517. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 19 × 88 = 1672. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 370 + 854 = 1224. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 721 + 248 = 969. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 456 + 348 = 805. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 76 × 69 = 5246. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 23 × 55 = 1265. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 532 + 865 = 1400. Correct or wrong? (a) correct (b) wrong

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