Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 188 · 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 + 658 = 1455. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 76 × 98 = 7448. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 33 × 62 = 2046. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 15 × 99 = 1485. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 66 × 28 = 1849. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 691 + 671 = 1362. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 61 × 46 = 2806. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 94 × 26 = 2441. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 446 + 346 = 792. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 57 × 97 = 5532. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 138 + 223 = 356. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 15 × 70 = 1050. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 576 + 348 = 924. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 63 × 29 = 1827. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 36 × 72 = 2593. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 87 × 95 = 8265. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 281 + 185 = 460. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 38 × 56 = 2135. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 87 × 95 = 8258. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 468 + 417 = 883. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 830 + 882 = 1709. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 28 × 15 = 420. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 419 + 750 = 1177. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 178 + 281 = 459. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 685 + 919 = 1604. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 369 + 449 = 819. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 332 + 455 = 784. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 60 × 79 = 4732. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 82 × 16 = 1312. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 55 × 37 = 2035. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 31 × 37 = 1140. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 16 × 69 = 1109. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 63 × 36 = 2268. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 279 + 834 = 1113. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 76 × 21 = 1604. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 39 × 45 = 1755. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 512 + 331 = 843. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 353 + 323 = 676. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 193 + 740 = 928. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 65 × 84 = 5458. Correct or wrong? (a) correct (b) wrong

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