Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 428 · 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: 86 × 26 = 2232. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 49 × 78 = 3822. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 326 + 494 = 820. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 44 × 57 = 2508. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 57 × 42 = 2394. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 215 + 893 = 1100. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 549 + 298 = 847. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 40 × 33 = 1320. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 78 × 35 = 2730. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 89 × 19 = 1691. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 82 × 54 = 4435. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 629 + 688 = 1317. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 676 + 949 = 1627. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 899 + 363 = 1267. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 88 × 27 = 2376. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 593 + 815 = 1410. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 90 × 50 = 4500. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 97 × 71 = 6887. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 60 × 24 = 1439. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 28 × 74 = 2072. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 337 + 995 = 1332. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 48 × 36 = 1728. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 188 + 315 = 506. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 679 + 328 = 1007. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 809 + 689 = 1498. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 236 + 833 = 1069. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 12 × 29 = 348. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 206 + 629 = 833. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 57 × 55 = 3130. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 973 + 166 = 1144. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 84 × 32 = 2688. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 30 × 89 = 2670. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 958 + 665 = 1617. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 590 + 998 = 1588. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 65 × 22 = 1431. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 177 + 797 = 974. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 233 + 506 = 739. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 758 + 135 = 899. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 86 × 70 = 6026. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 57 × 34 = 1930. Correct or wrong? (a) correct (b) wrong

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