Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 951 · 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: 405 + 550 = 955. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 79 × 56 = 4424. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 41 × 17 = 697. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 234 + 375 = 608. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 18 × 92 = 1656. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 947 + 341 = 1292. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 95 × 34 = 3230. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 544 + 796 = 1332. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 536 + 854 = 1397. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 223 + 458 = 686. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 34 × 15 = 512. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 18 × 14 = 252. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 64 × 81 = 5184. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 157 + 363 = 520. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 30 × 73 = 2190. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 72 × 41 = 2952. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 39 × 24 = 938. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 315 + 485 = 800. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 661 + 128 = 787. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 217 + 862 = 1085. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 33 × 70 = 2305. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 38 × 70 = 2668. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 16 × 30 = 485. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 94 × 68 = 6392. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 90 × 43 = 3875. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 281 + 241 = 525. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 372 + 780 = 1155. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 68 × 80 = 5438. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 651 + 616 = 1267. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 232 + 279 = 519. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 16 × 88 = 1408. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 251 + 491 = 735. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 77 × 61 = 4697. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 307 + 959 = 1270. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 88 × 95 = 8368. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 934 + 531 = 1466. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 90 × 88 = 7916. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 12 × 76 = 912. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 755 + 411 = 1166. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 85 × 20 = 1699. Correct or wrong? (a) correct (b) wrong

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