Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 455 · 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: 468 + 965 = 1433. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 51 × 25 = 1277. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 176 + 489 = 665. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 335 + 783 = 1112. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 18 × 93 = 1674. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 86 × 54 = 4644. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 68 × 86 = 5856. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 70 × 77 = 5390. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 680 + 335 = 1008. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 84 × 95 = 7980. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 53 × 15 = 790. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 77 × 56 = 4312. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 96 × 29 = 2790. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 878 + 234 = 1112. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 803 + 344 = 1147. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 766 + 651 = 1424. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 804 + 213 = 1021. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 185 + 484 = 669. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 600 + 717 = 1319. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 28 × 83 = 2324. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 228 + 582 = 810. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 19 × 81 = 1539. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 51 × 45 = 2295. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 12 × 85 = 1027. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 41 × 76 = 3117. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 15 × 91 = 1365. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 344 + 620 = 964. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 43 × 69 = 2967. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 353 + 563 = 916. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 844 + 512 = 1356. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 74 × 84 = 6211. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 949 + 541 = 1489. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 857 + 443 = 1300. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 13 × 80 = 1037. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 440 + 474 = 914. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 85 × 54 = 4585. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 13 × 19 = 252. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 515 + 269 = 784. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 861 + 177 = 1038. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 70 × 51 = 3568. Correct or wrong? (a) correct (b) wrong

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