Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 490 · 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: 405 + 761 = 1166. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 18 × 38 = 680. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 12 × 52 = 617. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 406 + 452 = 859. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 37 × 16 = 592. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 776 + 124 = 900. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 690 + 547 = 1237. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 62 × 33 = 2046. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 18 × 68 = 1224. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 360 + 501 = 861. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 61 × 87 = 5307. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 908 + 885 = 1793. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 25 × 26 = 655. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 350 + 883 = 1236. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 83 × 80 = 6643. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 63 × 25 = 1575. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 802 + 455 = 1257. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 956 + 617 = 1573. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 16 × 52 = 832. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 216 + 551 = 769. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 475 + 692 = 1166. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 64 × 84 = 5376. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 726 + 587 = 1319. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 986 + 972 = 1964. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 361 + 303 = 661. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 284 + 240 = 524. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 585 + 405 = 987. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 79 × 82 = 6478. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 485 + 677 = 1162. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 77 × 15 = 1155. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 734 + 461 = 1200. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 44 × 74 = 3256. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 953 + 475 = 1428. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 943 + 314 = 1257. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 19 × 97 = 1843. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 509 + 795 = 1306. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 643 + 354 = 997. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 999 + 591 = 1593. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 791 + 233 = 1024. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 39 × 85 = 3315. Correct or wrong? (a) correct (b) wrong

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