Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 210 · 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: 87 × 65 = 5655. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 762 + 296 = 1062. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 335 + 781 = 1124. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 68 × 92 = 6256. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 72 × 87 = 6266. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 56 × 69 = 3864. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 278 + 120 = 400. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 839 + 468 = 1309. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 882 + 959 = 1841. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 87 × 18 = 1566. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 482 + 804 = 1286. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 87 × 19 = 1653. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 570 + 259 = 829. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 17 × 81 = 1377. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 42 × 75 = 3150. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 76 × 98 = 7441. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 84 × 98 = 8232. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 947 + 713 = 1660. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 850 + 384 = 1234. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 86 × 62 = 5332. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 40 × 53 = 2120. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 374 + 953 = 1327. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 235 + 690 = 925. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 58 × 13 = 754. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 21 × 65 = 1363. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 198 + 239 = 437. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 628 + 384 = 1012. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 22 × 52 = 1148. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 253 + 859 = 1113. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 517 + 613 = 1137. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 38 × 23 = 873. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 67 × 59 = 3953. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 933 + 938 = 1869. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 405 + 451 = 851. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 27 × 38 = 1026. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 93 × 66 = 6143. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 66 × 49 = 3228. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 681 + 773 = 1454. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 587 + 120 = 715. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 32 × 18 = 576. Correct or wrong? (a) wrong (b) correct

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