Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 234 · 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: 31 × 14 = 434. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 958 + 537 = 1495. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 19 × 86 = 1634. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 97 × 50 = 4851. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 703 + 703 = 1406. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 20 × 57 = 1140. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 91 × 27 = 2457. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 71 × 42 = 2990. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 56 × 32 = 1798. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 723 + 976 = 1699. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 89 × 93 = 8277. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 99 × 50 = 4956. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 942 + 505 = 1447. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 403 + 351 = 754. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 29 × 94 = 2726. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 36 × 76 = 2730. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 81 × 12 = 973. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 33 × 49 = 1617. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 36 × 90 = 3244. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 24 × 37 = 895. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 15 × 25 = 375. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 259 + 613 = 872. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 610 + 905 = 1515. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 137 + 293 = 430. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 69 × 72 = 4968. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 640 + 297 = 932. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 965 + 964 = 1929. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 17 × 97 = 1649. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 60 × 42 = 2520. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 66 × 54 = 3563. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 12 × 38 = 456. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 27 × 66 = 1782. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 209 + 334 = 543. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 683 + 653 = 1336. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 273 + 622 = 887. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 934 + 555 = 1489. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 34 × 48 = 1632. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 49 × 28 = 1367. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 68 × 20 = 1360. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 417 + 687 = 1106. Correct or wrong? (a) correct (b) wrong

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