Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 447 · 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: 716 + 917 = 1633. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 60 × 27 = 1620. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 25 × 67 = 1675. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 450 + 429 = 879. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 53 × 80 = 4240. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 95 × 48 = 4560. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 156 + 217 = 373. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 97 × 14 = 1361. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 13 × 12 = 156. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 12 × 15 = 179. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 723 + 459 = 1182. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 339 + 799 = 1138. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 65 × 67 = 4354. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 75 × 33 = 2475. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 855 + 607 = 1467. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 77 × 54 = 4162. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 845 + 971 = 1816. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 712 + 784 = 1500. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 303 + 887 = 1190. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 547 + 687 = 1237. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 37 × 26 = 962. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 71 × 29 = 2059. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 17 × 29 = 486. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 14 × 95 = 1331. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 338 + 179 = 523. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 788 + 730 = 1524. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 519 + 187 = 698. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 455 + 604 = 1057. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 585 + 373 = 958. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 276 + 763 = 1043. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 63 × 21 = 1323. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 50 × 64 = 3200. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 658 + 207 = 870. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 78 × 43 = 3354. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 91 × 24 = 2184. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 533 + 385 = 910. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 46 × 65 = 2990. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 35 × 60 = 2100. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 92 × 73 = 6717. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 15 × 22 = 335. Correct or wrong? (a) wrong (b) correct

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