Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 67 · 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: 96 × 54 = 5184. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 16 × 29 = 467. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 38 × 93 = 3532. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 49 × 61 = 2989. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 197 + 164 = 361. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 512 + 684 = 1204. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 62 × 53 = 3286. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 68 × 84 = 5712. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 99 × 15 = 1478. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 330 + 990 = 1320. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 994 + 223 = 1218. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 663 + 680 = 1350. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 86 × 13 = 1124. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 709 + 972 = 1679. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 705 + 858 = 1563. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 20 × 15 = 300. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 68 × 75 = 5092. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 22 × 91 = 2004. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 50 × 92 = 4600. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 72 × 40 = 2880. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 596 + 818 = 1421. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 77 × 88 = 6776. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 437 + 188 = 629. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 368 + 375 = 740. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 570 + 712 = 1280. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 86 × 78 = 6708. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 700 + 864 = 1564. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 92 × 93 = 8556. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 397 + 699 = 1099. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 86 × 19 = 1629. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 630 + 266 = 896. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 99 × 40 = 3960. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 616 + 699 = 1323. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 12 × 82 = 988. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 612 + 238 = 853. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 452 + 311 = 765. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 64 × 68 = 4355. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 26 × 98 = 2546. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 357 + 330 = 695. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 832 + 612 = 1436. Correct or wrong? (a) wrong (b) correct

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