Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 155 · 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: 28 × 12 = 336. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 26 × 36 = 936. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 463 + 345 = 808. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 881 + 428 = 1309. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 232 + 254 = 486. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 89 × 71 = 6321. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 53 × 21 = 1108. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 883 + 514 = 1397. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 70 × 36 = 2527. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 83 × 69 = 5734. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 409 + 369 = 778. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 730 + 570 = 1300. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 80 × 22 = 1760. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 868 + 811 = 1679. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 41 × 42 = 1725. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 731 + 309 = 1040. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 84 × 65 = 5461. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 977 + 853 = 1830. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 93 × 12 = 1116. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 36 × 13 = 468. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 310 + 951 = 1261. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 57 × 58 = 3309. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 425 + 167 = 594. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 335 + 987 = 1322. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 135 + 458 = 593. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 97 × 35 = 3395. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 539 + 838 = 1377. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 660 + 890 = 1551. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 723 + 398 = 1121. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 205 + 176 = 386. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 351 + 857 = 1208. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 706 + 591 = 1302. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 288 + 338 = 626. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 17 × 22 = 379. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 336 + 484 = 821. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 72 × 57 = 4102. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 67 × 37 = 2473. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 13 × 84 = 1088. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 754 + 189 = 943. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 859 + 375 = 1239. Correct or wrong? (a) wrong (b) correct

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