Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 131 · 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: 147 + 518 = 659. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 473 + 738 = 1209. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 84 × 58 = 4872. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 34 × 90 = 3060. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 885 + 328 = 1213. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 58 × 34 = 1966. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 833 + 264 = 1097. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 46 × 50 = 2301. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 74 × 12 = 888. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 25 × 54 = 1348. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 32 × 49 = 1570. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 90 × 58 = 5220. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 90 × 82 = 7385. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 40 × 20 = 800. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 47 × 18 = 846. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 26 × 29 = 749. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 81 × 80 = 6481. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 745 + 622 = 1371. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 21 × 66 = 1388. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 175 + 532 = 707. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 22 × 47 = 1036. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 14 × 54 = 755. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 130 + 438 = 569. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 261 + 928 = 1189. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 56 × 85 = 4759. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 73 × 97 = 7081. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 49 × 51 = 2499. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 550 + 302 = 852. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 95 × 86 = 8170. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 43 × 34 = 1470. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 79 × 21 = 1659. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 964 + 570 = 1542. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 94 × 39 = 3658. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 960 + 817 = 1774. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 51 × 54 = 2760. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 138 + 715 = 853. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 69 × 30 = 2070. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 54 × 57 = 3078. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 238 + 516 = 752. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 63 × 65 = 4087. Correct or wrong? (a) correct (b) wrong

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