Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 398 · 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: 23 × 40 = 920. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 27 × 39 = 1051. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 399 + 958 = 1357. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 20 × 71 = 1413. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 25 × 17 = 425. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 210 + 196 = 414. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 460 + 388 = 848. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 53 × 90 = 4770. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 146 + 536 = 682. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 29 × 92 = 2668. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 13 × 34 = 446. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 22 × 38 = 836. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 69 × 32 = 2212. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 17 × 63 = 1079. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 218 + 444 = 666. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 341 + 379 = 722. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 436 + 678 = 1114. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 331 + 832 = 1159. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 931 + 215 = 1146. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 28 × 89 = 2486. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 83 × 17 = 1406. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 829 + 226 = 1062. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 60 × 85 = 5100. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 790 + 908 = 1698. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 27 × 97 = 2611. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 895 + 517 = 1407. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 777 + 923 = 1704. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 60 × 86 = 5160. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 78 × 35 = 2730. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 132 + 625 = 757. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 47 × 50 = 2350. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 17 × 40 = 680. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 20 × 20 = 400. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 78 × 56 = 4373. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 239 + 397 = 636. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 394 + 145 = 539. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 34 × 85 = 2890. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 937 + 363 = 1300. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 25 × 74 = 1849. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 73 × 52 = 3796. Correct or wrong? (a) correct (b) wrong

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