Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 801 · 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: 767 + 625 = 1387. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 786 + 835 = 1621. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 36 × 85 = 3060. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 32 × 60 = 1920. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 13 × 47 = 606. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 165 + 495 = 660. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 38 × 15 = 570. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 853 + 880 = 1733. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 82 × 96 = 7871. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 95 × 63 = 5979. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 72 × 44 = 3167. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 852 + 465 = 1322. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 14 × 37 = 511. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 766 + 492 = 1264. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 14 × 40 = 553. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 758 + 199 = 965. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 51 × 38 = 1938. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 35 × 93 = 3255. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 65 × 38 = 2463. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 916 + 591 = 1506. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 962 + 935 = 1897. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 82 × 49 = 4018. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 906 + 293 = 1199. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 276 + 520 = 796. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 924 + 901 = 1825. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 844 + 891 = 1735. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 39 × 93 = 3627. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 18 × 69 = 1242. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 603 + 451 = 1054. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 853 + 744 = 1597. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 760 + 265 = 1025. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 32 × 13 = 416. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 61 × 95 = 5795. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 465 + 656 = 1121. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 899 + 543 = 1442. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 64 × 89 = 5697. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 89 × 31 = 2757. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 27 × 41 = 1107. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 43 × 89 = 3824. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 967 + 331 = 1298. Correct or wrong? (a) wrong (b) correct

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