Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 750 · 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: 288 + 410 = 693. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 28 × 56 = 1568. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 69 × 20 = 1380. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 120 + 226 = 345. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 277 + 581 = 862. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 83 × 86 = 7139. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 94 × 53 = 4982. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 887 + 917 = 1803. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 23 × 68 = 1560. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 288 + 247 = 535. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 313 + 981 = 1293. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 870 + 524 = 1394. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 298 + 738 = 1042. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 37 × 96 = 3552. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 358 + 333 = 689. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 609 + 198 = 807. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 39 × 92 = 3584. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 205 + 353 = 563. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 321 + 785 = 1106. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 94 × 87 = 8178. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 380 + 908 = 1284. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 283 + 262 = 545. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 608 + 417 = 1025. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 93 × 83 = 7725. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 13 × 31 = 398. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 83 × 99 = 8225. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 85 × 74 = 6287. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 44 × 42 = 1842. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 47 × 63 = 2961. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 464 + 281 = 745. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 929 + 171 = 1097. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 33 × 25 = 825. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 301 + 912 = 1213. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 43 × 19 = 817. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 823 + 364 = 1182. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 19 × 31 = 589. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 537 + 393 = 930. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 36 × 49 = 1759. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 236 + 464 = 700. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 57 × 36 = 2052. Correct or wrong? (a) wrong (b) correct

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