Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 918 · 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: 46 × 68 = 3128. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 940 + 341 = 1277. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 609 + 845 = 1460. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 589 + 218 = 807. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 577 + 674 = 1251. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 154 + 897 = 1051. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 28 × 95 = 2660. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 429 + 836 = 1267. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 47 × 54 = 2540. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 72 × 72 = 5184. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 57 × 43 = 2457. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 618 + 853 = 1469. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 19 × 92 = 1743. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 167 + 182 = 349. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 400 + 462 = 863. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 269 + 638 = 910. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 81 × 27 = 2189. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 489 + 654 = 1143. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 509 + 470 = 979. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 195 + 486 = 679. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 576 + 245 = 821. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 777 + 920 = 1693. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 56 × 32 = 1792. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 47 × 87 = 4089. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 126 + 230 = 356. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 19 × 90 = 1718. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 723 + 651 = 1378. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 697 + 642 = 1341. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 76 × 87 = 6612. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 452 + 371 = 823. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 20 × 81 = 1624. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 222 + 495 = 717. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 86 × 82 = 7059. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 74 × 79 = 5852. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 155 + 732 = 885. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 57 × 85 = 4845. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 29 × 68 = 1972. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 896 + 472 = 1368. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 295 + 845 = 1140. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 43 × 39 = 1683. Correct or wrong? (a) wrong (b) correct

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