Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 392 · 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: 970 + 536 = 1500. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 156 + 544 = 700. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 67 × 48 = 3216. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 709 + 588 = 1297. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 410 + 417 = 820. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 95 × 44 = 4179. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 33 × 86 = 2839. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 479 + 719 = 1198. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 83 × 17 = 1411. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 95 × 65 = 6178. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 693 + 682 = 1375. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 363 + 692 = 1048. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 46 × 86 = 3956. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 69 × 44 = 3036. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 60 × 32 = 1920. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 587 + 963 = 1550. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 86 × 64 = 5504. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 85 × 44 = 3740. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 587 + 862 = 1441. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 529 + 248 = 777. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 17 × 53 = 903. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 218 + 308 = 529. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 696 + 356 = 1056. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 763 + 353 = 1111. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 360 + 897 = 1251. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 948 + 327 = 1270. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 56 × 59 = 3302. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 793 + 469 = 1270. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 934 + 907 = 1848. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 979 + 794 = 1773. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 16 × 32 = 512. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 36 × 13 = 469. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 138 + 157 = 288. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 455 + 133 = 586. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 77 × 83 = 6383. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 672 + 601 = 1273. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 778 + 825 = 1603. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 729 + 555 = 1284. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 980 + 371 = 1351. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 49 × 75 = 3675. Correct or wrong? (a) correct (b) wrong

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