Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 937 · 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: 29 × 43 = 1249. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 635 + 387 = 1025. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 850 + 410 = 1260. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 74 × 30 = 2225. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 390 + 424 = 814. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 181 + 372 = 553. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 40 × 57 = 2283. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 87 × 71 = 6176. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 28 × 64 = 1792. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 869 + 357 = 1222. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 534 + 808 = 1337. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 537 + 197 = 742. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 680 + 673 = 1353. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 57 × 41 = 2337. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 52 × 39 = 2029. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 621 + 456 = 1079. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 43 × 38 = 1634. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 271 + 844 = 1120. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 851 + 481 = 1336. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 32 × 54 = 1733. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 13 × 12 = 156. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 466 + 576 = 1047. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 31 × 22 = 678. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 781 + 301 = 1082. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 324 + 197 = 521. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 977 + 776 = 1761. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 262 + 391 = 645. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 559 + 727 = 1288. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 85 × 42 = 3570. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 95 × 15 = 1425. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 54 × 18 = 979. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 410 + 473 = 883. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 81 × 32 = 2588. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 98 × 87 = 8526. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 781 + 398 = 1171. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 87 × 72 = 6271. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 79 × 17 = 1343. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 35 × 56 = 1960. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 72 × 95 = 6840. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 339 + 153 = 494. Correct or wrong? (a) wrong (b) correct

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