Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 330 · 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: 375 + 503 = 878. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 62 × 55 = 3410. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 82 × 56 = 4592. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 38 × 33 = 1255. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 67 × 19 = 1273. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 60 × 13 = 780. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 887 + 791 = 1678. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 580 + 894 = 1474. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 495 + 127 = 624. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 353 + 735 = 1088. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 884 + 360 = 1244. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 18 × 62 = 1121. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 69 × 32 = 2216. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 299 + 424 = 723. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 24 × 85 = 2040. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 881 + 619 = 1500. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 60 × 23 = 1382. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 328 + 363 = 696. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 730 + 346 = 1076. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 31 × 15 = 466. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 56 × 29 = 1623. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 413 + 315 = 728. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 173 + 404 = 577. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 270 + 270 = 542. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 18 × 33 = 594. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 81 × 52 = 4216. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 834 + 272 = 1106. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 53 × 86 = 4560. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 90 × 27 = 2428. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 464 + 315 = 779. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 20 × 69 = 1380. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 855 + 625 = 1476. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 339 + 454 = 791. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 334 + 275 = 606. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 458 + 183 = 641. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 43 × 34 = 1455. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 152 + 704 = 851. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 30 × 70 = 2100. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 31 × 35 = 1085. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 741 + 801 = 1550. Correct or wrong? (a) correct (b) wrong

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