Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 473 · 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: 542 + 567 = 1109. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 79 × 45 = 3555. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 34 × 55 = 1863. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 735 + 556 = 1291. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 369 + 364 = 733. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 98 × 54 = 5292. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 934 + 677 = 1617. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 86 × 79 = 6786. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 26 × 57 = 1483. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 387 + 290 = 677. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 12 × 80 = 965. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 553 + 491 = 1051. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 45 × 60 = 2700. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 92 × 89 = 8188. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 52 × 35 = 1824. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 26 × 60 = 1553. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 82 × 64 = 5249. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 34 × 36 = 1223. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 855 + 428 = 1283. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 350 + 422 = 772. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 348 + 520 = 871. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 21 × 76 = 1596. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 628 + 283 = 912. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 224 + 369 = 589. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 637 + 182 = 814. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 40 × 93 = 3720. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 844 + 261 = 1105. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 12 × 34 = 411. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 22 × 28 = 618. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 33 × 71 = 2343. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 24 × 94 = 2259. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 767 + 527 = 1294. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 637 + 665 = 1302. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 45 × 96 = 4323. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 278 + 174 = 458. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 879 + 580 = 1465. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 37 × 47 = 1739. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 82 × 77 = 6319. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 26 × 34 = 884. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 384 + 226 = 610. Correct or wrong? (a) correct (b) wrong

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