Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 3 · 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: 83 × 59 = 4889. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 457 + 369 = 826. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 485 + 669 = 1154. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 43 × 22 = 946. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 828 + 738 = 1563. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 76 × 87 = 6612. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 401 + 658 = 1059. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 318 + 292 = 610. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 30 × 38 = 1144. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 580 + 395 = 975. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 43 × 39 = 1677. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 620 + 321 = 936. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 380 + 649 = 1029. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 90 × 46 = 4142. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 41 × 36 = 1476. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 925 + 955 = 1886. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 581 + 466 = 1040. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 737 + 541 = 1278. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 195 + 594 = 789. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 70 × 56 = 3922. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 57 × 84 = 4780. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 87 × 30 = 2611. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 82 × 16 = 1318. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 77 × 57 = 4389. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 999 + 858 = 1857. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 511 + 444 = 948. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 65 × 74 = 4810. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 261 + 496 = 759. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 943 + 565 = 1514. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 29 × 44 = 1276. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 773 + 939 = 1712. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 58 × 58 = 3361. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 51 × 80 = 4080. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 948 + 527 = 1475. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 68 × 99 = 6732. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 375 + 308 = 683. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 50 × 39 = 1954. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 55 × 24 = 1326. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 91 × 66 = 6006. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 446 + 149 = 600. Correct or wrong? (a) wrong (b) correct

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