Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 380 · 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: 171 + 257 = 436. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 873 + 235 = 1108. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 175 + 520 = 695. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 951 + 198 = 1149. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 76 × 19 = 1442. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 258 + 719 = 984. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 61 × 74 = 4520. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 308 + 642 = 942. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 735 + 389 = 1124. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 66 × 77 = 5081. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 963 + 262 = 1225. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 730 + 535 = 1263. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 81 × 13 = 1045. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 32 × 55 = 1763. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 800 + 880 = 1680. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 66 × 46 = 3036. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 37 × 86 = 3180. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 630 + 465 = 1097. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 325 + 170 = 487. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 31 × 55 = 1705. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 85 × 45 = 3827. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 244 + 936 = 1186. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 85 × 62 = 5263. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 61 × 84 = 5118. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 80 × 12 = 959. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 51 × 21 = 1071. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 35 × 63 = 2205. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 22 × 88 = 1929. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 21 × 57 = 1197. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 867 + 691 = 1555. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 31 × 49 = 1519. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 581 + 804 = 1383. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 25 × 20 = 507. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 75 × 39 = 2925. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 27 × 22 = 594. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 527 + 691 = 1222. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 915 + 916 = 1832. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 79 × 99 = 7821. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 430 + 281 = 711. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 79 × 54 = 4260. Correct or wrong? (a) correct (b) wrong

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