Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 414 · 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: 74 × 79 = 5852. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 97 × 29 = 2813. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 616 + 236 = 852. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 363 + 781 = 1143. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 165 + 872 = 1031. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 433 + 320 = 753. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 24 × 33 = 792. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 747 + 175 = 922. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 73 × 49 = 3572. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 986 + 942 = 1928. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 97 × 32 = 3104. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 47 × 29 = 1363. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 92 × 47 = 4332. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 59 × 25 = 1475. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 15 × 45 = 667. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 77 × 45 = 3465. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 362 + 846 = 1208. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 653 + 699 = 1353. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 453 + 192 = 645. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 96 × 76 = 7293. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 30 × 43 = 1282. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 59 × 23 = 1352. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 350 + 416 = 766. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 748 + 608 = 1356. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 92 × 28 = 2576. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 773 + 640 = 1413. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 63 × 56 = 3528. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 737 + 770 = 1507. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 185 + 435 = 618. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 701 + 269 = 970. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 43 × 13 = 559. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 30 × 71 = 2130. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 37 × 29 = 1073. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 73 × 92 = 6716. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 16 × 56 = 901. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 48 × 25 = 1200. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 24 × 72 = 1728. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 87 × 68 = 5916. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 733 + 522 = 1255. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 750 + 965 = 1711. Correct or wrong? (a) wrong (b) correct

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