Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 410 · 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: 590 + 765 = 1356. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 922 + 595 = 1521. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 295 + 959 = 1254. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 85 × 34 = 2890. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 25 × 89 = 2232. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 825 + 217 = 1042. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 377 + 165 = 543. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 31 × 17 = 527. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 64 × 32 = 2054. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 46 × 45 = 2070. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 607 + 839 = 1438. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 372 + 244 = 617. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 386 + 886 = 1279. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 94 × 43 = 4042. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 917 + 271 = 1181. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 546 + 440 = 984. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 884 + 327 = 1205. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 41 × 91 = 3726. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 369 + 160 = 529. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 24 × 29 = 696. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 29 × 28 = 812. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 22 × 50 = 1100. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 903 + 164 = 1067. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 141 + 833 = 974. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 40 × 49 = 1960. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 17 × 35 = 596. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 277 + 487 = 765. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 274 + 418 = 694. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 74 × 88 = 6505. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 85 × 44 = 3743. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 195 + 577 = 772. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 293 + 179 = 474. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 39 × 45 = 1755. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 66 × 91 = 6013. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 27 × 42 = 1138. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 155 + 395 = 542. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 24 × 40 = 956. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 217 + 931 = 1148. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 181 + 885 = 1066. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 513 + 906 = 1418. Correct or wrong? (a) wrong (b) correct

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