Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 660 · 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: 475 + 749 = 1224. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 233 + 196 = 429. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 65 × 24 = 1560. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 31 × 82 = 2537. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 876 + 131 = 1007. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 24 × 57 = 1368. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 32 × 56 = 1792. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 31 × 82 = 2536. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 40 × 90 = 3600. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 672 + 248 = 921. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 56 × 87 = 4865. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 677 + 757 = 1438. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 227 + 628 = 855. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 64 × 50 = 3200. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 552 + 453 = 1007. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 370 + 499 = 873. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 94 × 16 = 1504. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 44 × 65 = 2860. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 600 + 516 = 1116. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 634 + 134 = 768. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 54 × 63 = 3396. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 31 × 82 = 2549. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 505 + 170 = 675. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 93 × 97 = 9021. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 912 + 367 = 1279. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 12 × 38 = 448. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 81 × 48 = 3888. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 20 × 17 = 341. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 457 + 298 = 755. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 96 × 21 = 2016. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 632 + 512 = 1144. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 21 × 60 = 1260. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 78 × 36 = 2807. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 960 + 820 = 1780. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 56 × 60 = 3360. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 58 × 86 = 4988. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 326 + 914 = 1240. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 403 + 452 = 860. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 14 × 58 = 812. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 59 × 95 = 5605. Correct or wrong? (a) correct (b) wrong

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