Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 898 · 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: 527 + 697 = 1224. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 27 × 31 = 836. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 19 × 28 = 532. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 47 × 94 = 4415. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 485 + 743 = 1228. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 821 + 733 = 1555. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 196 + 999 = 1195. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 753 + 863 = 1616. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 386 + 628 = 1014. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 19 × 88 = 1672. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 49 × 46 = 2252. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 126 + 336 = 462. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 89 × 13 = 1158. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 983 + 852 = 1840. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 72 × 79 = 5688. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 609 + 306 = 915. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 29 × 17 = 494. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 943 + 622 = 1565. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 904 + 424 = 1333. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 47 × 44 = 2068. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 180 + 391 = 570. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 42 × 21 = 890. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 803 + 125 = 928. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 845 + 588 = 1433. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 481 + 321 = 798. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 57 × 99 = 5642. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 16 × 63 = 1007. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 90 × 26 = 2340. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 380 + 443 = 823. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 848 + 677 = 1521. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 626 + 778 = 1404. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 16 × 65 = 1035. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 305 + 971 = 1280. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 84 × 86 = 7225. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 434 + 233 = 667. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 131 + 658 = 794. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 86 × 97 = 8342. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 44 × 73 = 3218. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 18 × 42 = 763. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 36 × 37 = 1332. Correct or wrong? (a) wrong (b) correct

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