Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 854 · 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: 45 × 18 = 810. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 65 × 25 = 1623. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 652 + 709 = 1361. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 55 × 50 = 2750. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 484 + 684 = 1168. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 708 + 935 = 1651. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 832 + 764 = 1596. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 451 + 856 = 1307. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 968 + 702 = 1670. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 689 + 805 = 1498. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 286 + 643 = 935. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 266 + 390 = 656. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 848 + 366 = 1217. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 60 × 76 = 4560. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 20 × 36 = 726. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 865 + 659 = 1516. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 59 × 53 = 3127. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 83 × 14 = 1156. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 12 × 74 = 890. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 97 × 92 = 8925. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 55 × 26 = 1430. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 52 × 27 = 1406. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 86 × 49 = 4211. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 42 × 75 = 3156. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 147 + 250 = 397. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 19 × 99 = 1881. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 639 + 491 = 1130. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 198 + 840 = 1038. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 88 × 43 = 3789. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 86 × 36 = 3097. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 43 × 62 = 2658. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 89 × 79 = 7031. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 80 × 61 = 4880. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 973 + 401 = 1379. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 869 + 250 = 1119. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 769 + 654 = 1431. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 98 × 30 = 2939. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 56 × 65 = 3640. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 49 × 48 = 2358. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 72 × 95 = 6836. Correct or wrong? (a) wrong (b) correct

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