Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 113 · 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: 12 × 95 = 1142. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 34 × 95 = 3230. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 37 × 16 = 590. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 35 × 43 = 1505. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 916 + 140 = 1056. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 207 + 239 = 448. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 70 × 64 = 4480. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 979 + 514 = 1489. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 76 × 89 = 6764. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 677 + 930 = 1607. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 53 × 14 = 740. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 32 × 86 = 2753. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 56 × 72 = 4032. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 124 + 467 = 591. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 86 × 84 = 7224. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 22 × 27 = 588. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 871 + 614 = 1487. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 59 × 81 = 4785. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 388 + 908 = 1296. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 85 × 74 = 6290. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 196 + 850 = 1053. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 97 × 14 = 1364. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 26 × 50 = 1294. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 41 × 28 = 1154. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 40 × 32 = 1284. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 63 × 30 = 1890. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 89 × 48 = 4272. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 93 × 78 = 7254. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 761 + 231 = 992. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 51 × 91 = 4641. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 123 + 330 = 453. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 359 + 870 = 1232. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 167 + 732 = 899. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 83 × 20 = 1663. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 37 × 52 = 1917. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 170 + 525 = 689. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 506 + 273 = 784. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 18 × 96 = 1728. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 71 × 85 = 6035. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 599 + 567 = 1166. Correct or wrong? (a) wrong (b) correct

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