Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 23 · 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: 797 + 850 = 1647. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 85 × 22 = 1870. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 96 × 36 = 3458. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 52 × 18 = 936. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 447 + 130 = 581. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 25 × 91 = 2275. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 25 × 94 = 2347. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 64 × 49 = 3136. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 214 + 863 = 1084. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 12 × 60 = 720. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 920 + 622 = 1542. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 53 × 39 = 2068. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 753 + 937 = 1686. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 554 + 196 = 750. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 76 × 38 = 2888. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 21 × 88 = 1848. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 62 × 99 = 6141. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 79 × 56 = 4417. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 89 × 12 = 1060. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 431 + 270 = 701. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 864 + 798 = 1662. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 466 + 660 = 1130. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 855 + 763 = 1617. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 87 × 38 = 3306. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 20 × 12 = 240. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 514 + 869 = 1383. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 52 × 85 = 4413. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 46 × 54 = 2484. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 376 + 324 = 699. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 933 + 344 = 1277. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 56 × 17 = 952. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 315 + 185 = 492. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 50 × 13 = 642. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 124 + 227 = 346. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 656 + 657 = 1319. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 84 × 23 = 1936. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 90 × 93 = 8370. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 370 + 935 = 1302. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 12 × 35 = 425. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 237 + 236 = 477. Correct or wrong? (a) correct (b) wrong

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