Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 613 · 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: 638 + 984 = 1622. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 17 × 43 = 731. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 847 + 773 = 1627. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 353 + 254 = 607. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 702 + 193 = 896. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 201 + 357 = 558. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 84 × 70 = 5880. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 574 + 767 = 1347. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 15 × 48 = 720. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 434 + 269 = 708. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 49 × 33 = 1617. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 29 × 54 = 1566. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 136 + 737 = 873. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 569 + 863 = 1432. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 51 × 15 = 765. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 21 × 12 = 252. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 46 × 28 = 1288. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 92 × 22 = 2024. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 43 × 68 = 2924. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 38 × 41 = 1565. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 411 + 909 = 1312. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 85 × 33 = 2805. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 350 + 957 = 1304. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 992 + 276 = 1268. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 99 × 25 = 2475. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 71 × 76 = 5396. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 40 × 24 = 953. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 244 + 955 = 1203. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 31 × 38 = 1178. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 850 + 319 = 1173. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 749 + 790 = 1539. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 37 × 45 = 1663. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 445 + 313 = 752. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 89 × 77 = 6853. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 20 × 53 = 1060. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 85 × 13 = 1105. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 232 + 278 = 510. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 596 + 736 = 1332. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 128 + 591 = 719. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 31 × 30 = 930. Correct or wrong? (a) correct (b) wrong

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