Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 311 · 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: 45 × 45 = 2029. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 876 + 207 = 1091. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 91 × 54 = 4914. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 14 × 66 = 928. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 189 + 420 = 610. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 780 + 819 = 1595. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 88 × 52 = 4571. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 72 × 44 = 3168. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 26 × 40 = 1040. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 97 × 56 = 5432. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 18 × 70 = 1254. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 385 + 511 = 896. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 37 × 50 = 1845. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 32 × 70 = 2240. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 93 × 60 = 5587. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 440 + 145 = 585. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 168 + 895 = 1065. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 57 × 69 = 3935. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 893 + 886 = 1779. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 64 × 47 = 3008. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 69 × 97 = 6690. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 742 + 730 = 1467. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 49 × 98 = 4803. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 908 + 394 = 1302. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 591 + 128 = 718. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 533 + 596 = 1137. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 93 × 13 = 1205. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 366 + 878 = 1244. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 919 + 420 = 1337. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 33 × 28 = 920. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 718 + 641 = 1359. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 50 × 12 = 600. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 95 × 30 = 2850. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 28 × 96 = 2688. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 377 + 867 = 1244. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 29 × 56 = 1629. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 669 + 559 = 1224. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 21 × 59 = 1246. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 948 + 123 = 1066. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 45 × 35 = 1575. Correct or wrong? (a) wrong (b) correct

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