Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 688 · 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: 75 × 68 = 5092. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 724 + 261 = 985. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 90 × 30 = 2700. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 19 × 18 = 336. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 99 × 60 = 5940. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 97 × 97 = 9409. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 962 + 332 = 1300. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 657 + 732 = 1389. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 93 × 16 = 1488. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 91 × 18 = 1645. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 14 × 19 = 266. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 832 + 747 = 1577. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 20 × 38 = 768. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 242 + 692 = 929. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 39 × 78 = 3042. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 45 × 37 = 1668. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 16 × 41 = 656. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 68 × 38 = 2584. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 925 + 822 = 1747. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 95 × 26 = 2470. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 77 × 88 = 6780. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 919 + 510 = 1422. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 625 + 162 = 792. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 67 × 31 = 2077. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 51 × 42 = 2142. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 75 × 61 = 4574. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 50 × 35 = 1750. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 280 + 481 = 761. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 57 × 39 = 2224. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 69 × 40 = 2760. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 594 + 967 = 1561. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 79 × 24 = 1896. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 18 × 69 = 1242. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 37 × 27 = 999. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 571 + 671 = 1242. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 24 × 93 = 2240. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 24 × 86 = 2065. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 63 × 19 = 1197. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 919 + 547 = 1458. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 684 + 398 = 1082. Correct or wrong? (a) correct (b) wrong

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