Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 278 · 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: 637 + 157 = 794. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 327 + 269 = 592. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 990 + 726 = 1716. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 17 × 78 = 1326. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 395 + 911 = 1306. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 63 × 88 = 5544. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 446 + 442 = 888. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 66 × 40 = 2640. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 291 + 812 = 1102. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 96 × 43 = 4128. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 23 × 17 = 392. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 29 × 14 = 411. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 355 + 462 = 817. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 933 + 898 = 1831. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 202 + 237 = 437. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 52 × 75 = 3900. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 143 + 822 = 965. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 631 + 377 = 1013. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 421 + 838 = 1259. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 210 + 597 = 808. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 74 × 13 = 962. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 70 × 61 = 4264. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 73 × 61 = 4459. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 67 × 54 = 3618. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 709 + 725 = 1434. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 210 + 658 = 861. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 137 + 560 = 699. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 661 + 984 = 1645. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 501 + 932 = 1440. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 57 × 91 = 5187. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 763 + 179 = 943. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 30 × 15 = 445. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 90 × 87 = 7826. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 91 × 37 = 3366. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 23 × 28 = 650. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 58 × 77 = 4466. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 41 × 33 = 1353. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 859 + 588 = 1450. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 977 + 605 = 1583. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 305 + 728 = 1027. Correct or wrong? (a) wrong (b) correct

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