Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 382 · 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: 39 × 63 = 2457. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 200 + 236 = 430. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 710 + 378 = 1088. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 933 + 422 = 1358. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 60 × 44 = 2640. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 845 + 140 = 980. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 79 × 83 = 6557. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 77 × 75 = 5775. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 568 + 239 = 809. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 67 × 81 = 5431. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 61 × 33 = 2013. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 138 + 339 = 480. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 13 × 95 = 1235. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 596 + 919 = 1512. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 16 × 99 = 1584. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 224 + 912 = 1141. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 96 × 19 = 1824. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 55 × 39 = 2139. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 62 × 97 = 6014. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 837 + 772 = 1609. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 712 + 134 = 842. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 13 × 82 = 1069. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 431 + 229 = 658. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 97 × 76 = 7372. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 45 × 64 = 2885. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 74 × 56 = 4149. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 74 × 15 = 1102. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 14 × 65 = 911. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 791 + 472 = 1267. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 77 × 74 = 5698. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 539 + 223 = 762. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 434 + 303 = 737. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 582 + 660 = 1234. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 59 × 99 = 5846. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 410 + 155 = 568. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 38 × 20 = 760. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 52 × 36 = 1877. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 220 + 787 = 1011. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 959 + 922 = 1877. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 136 + 770 = 907. Correct or wrong? (a) correct (b) wrong

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