Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 297 · 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 × 57 = 1767. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 35 × 83 = 2905. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 24 × 66 = 1580. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 556 + 636 = 1198. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 557 + 435 = 991. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 24 × 80 = 1920. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 14 × 69 = 968. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 353 + 610 = 963. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 373 + 240 = 609. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 71 × 54 = 3833. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 170 + 368 = 544. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 879 + 664 = 1536. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 54 × 84 = 4535. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 761 + 163 = 921. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 53 × 93 = 4929. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 843 + 214 = 1059. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 799 + 992 = 1795. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 54 × 39 = 2106. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 26 × 96 = 2496. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 644 + 305 = 949. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 28 × 41 = 1154. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 581 + 583 = 1171. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 983 + 291 = 1274. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 74 × 60 = 4436. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 25 × 85 = 2125. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 825 + 429 = 1261. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 726 + 636 = 1357. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 12 × 57 = 678. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 81 × 86 = 6969. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 753 + 561 = 1314. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 81 × 46 = 3726. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 867 + 351 = 1218. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 556 + 324 = 886. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 75 × 43 = 3232. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 39 × 19 = 735. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 396 + 824 = 1220. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 20 × 42 = 840. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 98 × 99 = 9697. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 694 + 860 = 1556. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 243 + 252 = 488. Correct or wrong? (a) correct (b) wrong

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