Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 66 · 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: 573 + 851 = 1424. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 92 × 69 = 6346. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 79 × 30 = 2370. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 429 + 233 = 662. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 332 + 578 = 910. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 517 + 837 = 1354. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 931 + 254 = 1185. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 878 + 404 = 1288. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 960 + 484 = 1451. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 82 × 32 = 2616. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 51 × 88 = 4492. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 154 + 600 = 757. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 358 + 620 = 971. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 952 + 854 = 1806. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 782 + 348 = 1138. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 66 × 63 = 4162. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 996 + 177 = 1175. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 61 × 30 = 1830. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 44 × 22 = 968. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 494 + 729 = 1223. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 676 + 265 = 936. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 72 × 65 = 4685. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 29 × 81 = 2349. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 372 + 303 = 675. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 487 + 503 = 995. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 581 + 783 = 1356. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 74 × 33 = 2440. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 66 × 80 = 5279. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 456 + 399 = 855. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 279 + 940 = 1215. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 96 × 25 = 2398. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 91 × 35 = 3185. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 20 × 96 = 1920. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 454 + 802 = 1256. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 216 + 335 = 551. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 25 × 60 = 1494. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 364 + 208 = 572. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 22 × 43 = 948. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 75 × 58 = 4355. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 710 + 297 = 1007. Correct or wrong? (a) wrong (b) correct

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