Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 680 · 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: 260 + 872 = 1132. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 13 × 71 = 923. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 69 × 54 = 3726. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 198 + 699 = 897. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 17 × 12 = 204. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 27 × 48 = 1289. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 24 × 66 = 1586. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 65 × 28 = 1820. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 20 × 81 = 1617. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 87 × 91 = 7917. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 30 × 59 = 1771. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 69 × 67 = 4615. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 627 + 650 = 1272. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 870 + 165 = 1035. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 744 + 582 = 1326. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 60 × 67 = 4020. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 81 × 55 = 4455. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 302 + 886 = 1188. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 59 × 20 = 1180. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 24 × 77 = 1854. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 987 + 177 = 1164. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 27 × 53 = 1430. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 367 + 515 = 882. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 878 + 944 = 1822. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 33 × 73 = 2417. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 563 + 905 = 1469. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 20 × 56 = 1128. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 19 × 16 = 304. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 62 × 31 = 1922. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 84 × 57 = 4788. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 57 × 20 = 1135. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 901 + 403 = 1304. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 97 × 46 = 4465. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 44 × 66 = 2904. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 60 × 63 = 3779. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 75 × 93 = 6979. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 54 × 88 = 4752. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 74 × 63 = 4659. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 81 × 40 = 3240. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 277 + 381 = 658. Correct or wrong? (a) wrong (b) correct

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