Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 359 · 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: 40 × 97 = 3877. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 15 × 54 = 810. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 81 × 17 = 1378. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 17 × 45 = 761. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 74 × 21 = 1558. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 614 + 282 = 896. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 98 × 81 = 7938. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 23 × 16 = 368. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 73 × 48 = 3504. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 262 + 711 = 973. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 66 × 17 = 1122. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 64 × 41 = 2632. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 123 + 233 = 360. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 49 × 93 = 4563. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 54 × 78 = 4213. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 130 + 580 = 717. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 351 + 593 = 940. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 392 + 556 = 948. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 45 × 91 = 4087. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 51 × 30 = 1530. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 595 + 152 = 753. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 86 × 17 = 1462. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 177 + 748 = 917. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 39 × 83 = 3240. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 72 × 29 = 2081. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 953 + 779 = 1737. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 588 + 131 = 719. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 648 + 323 = 976. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 135 + 172 = 314. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 739 + 350 = 1089. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 66 × 75 = 4949. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 31 × 58 = 1798. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 614 + 161 = 774. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 35 × 76 = 2668. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 78 × 68 = 5308. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 12 × 29 = 348. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 36 × 78 = 2807. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 152 + 781 = 933. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 761 + 310 = 1071. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 99 × 42 = 4158. Correct or wrong? (a) correct (b) wrong

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