Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 30 · 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: 799 + 995 = 1787. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 21 × 33 = 693. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 421 + 602 = 1023. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 45 × 62 = 2790. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 34 × 19 = 642. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 996 + 441 = 1437. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 639 + 144 = 783. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 285 + 909 = 1196. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 758 + 563 = 1321. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 62 × 19 = 1178. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 95 × 65 = 6169. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 16 × 44 = 704. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 96 × 75 = 7200. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 187 + 829 = 1023. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 13 × 15 = 199. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 13 × 16 = 208. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 94 × 58 = 5452. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 805 + 784 = 1592. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 58 × 35 = 2030. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 303 + 590 = 896. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 44 × 13 = 576. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 87 × 47 = 4089. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 80 × 72 = 5763. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 24 × 15 = 360. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 817 + 509 = 1318. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 940 + 435 = 1375. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 125 + 585 = 710. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 57 × 13 = 741. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 458 + 496 = 954. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 630 + 963 = 1592. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 63 × 84 = 5292. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 39 × 20 = 780. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 51 × 88 = 4488. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 488 + 301 = 796. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 61 × 34 = 2066. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 515 + 938 = 1451. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 695 + 398 = 1093. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 82 × 66 = 5412. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 27 × 48 = 1299. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 826 + 507 = 1333. Correct or wrong? (a) correct (b) wrong

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