Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 54 · 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: 48 × 38 = 1824. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 971 + 767 = 1738. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 12 × 68 = 814. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 831 + 699 = 1530. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 42 × 58 = 2436. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 782 + 884 = 1666. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 793 + 319 = 1112. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 37 × 28 = 1037. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 644 + 816 = 1463. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 91 × 15 = 1361. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 95 × 21 = 1995. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 961 + 791 = 1752. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 45 × 17 = 766. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 72 × 56 = 4032. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 57 × 15 = 855. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 420 + 698 = 1113. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 74 × 78 = 5772. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 466 + 999 = 1471. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 65 × 65 = 4223. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 865 + 941 = 1806. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 745 + 442 = 1187. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 772 + 945 = 1717. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 80 × 60 = 4798. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 158 + 950 = 1108. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 20 × 36 = 720. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 804 + 494 = 1298. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 73 × 64 = 4674. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 615 + 663 = 1278. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 61 × 61 = 3721. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 218 + 289 = 507. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 573 + 712 = 1285. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 74 × 38 = 2812. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 52 × 13 = 676. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 409 + 577 = 989. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 44 × 34 = 1496. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 625 + 253 = 878. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 425 + 776 = 1200. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 872 + 464 = 1336. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 637 + 660 = 1299. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 414 + 721 = 1135. Correct or wrong? (a) wrong (b) correct

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