Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 112 · 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: 252 + 567 = 824. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 87 × 64 = 5574. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 294 + 498 = 784. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 135 + 303 = 438. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 28 × 98 = 2744. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 70 × 87 = 6098. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 595 + 810 = 1398. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 23 × 90 = 2076. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 85 × 64 = 5434. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 215 + 993 = 1208. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 965 + 631 = 1596. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 845 + 762 = 1615. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 191 + 940 = 1137. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 332 + 126 = 458. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 71 × 78 = 5534. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 511 + 457 = 975. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 65 × 17 = 1105. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 698 + 179 = 876. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 83 × 51 = 4233. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 74 × 15 = 1110. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 901 + 941 = 1842. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 535 + 331 = 863. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 26 × 16 = 415. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 896 + 257 = 1158. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 679 + 139 = 826. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 87 × 83 = 7218. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 27 × 98 = 2646. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 54 × 18 = 974. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 26 × 31 = 806. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 38 × 47 = 1790. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 60 × 42 = 2520. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 477 + 893 = 1367. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 254 + 894 = 1148. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 272 + 331 = 611. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 393 + 225 = 618. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 946 + 980 = 1928. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 52 × 55 = 2868. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 91 × 77 = 7008. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 96 × 71 = 6812. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 304 + 800 = 1104. Correct or wrong? (a) wrong (b) correct

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