Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 919 · 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: 698 + 974 = 1672. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 38 × 43 = 1630. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 79 × 28 = 2212. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 340 + 981 = 1321. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 49 × 57 = 2793. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 35 × 53 = 1854. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 474 + 715 = 1189. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 676 + 126 = 802. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 267 + 685 = 952. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 408 + 961 = 1369. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 60 × 79 = 4735. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 305 + 926 = 1225. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 39 × 48 = 1872. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 64 × 49 = 3136. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 47 × 85 = 4000. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 881 + 423 = 1304. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 589 + 136 = 725. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 85 × 73 = 6205. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 663 + 313 = 976. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 857 + 135 = 996. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 37 × 56 = 2080. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 14 × 23 = 315. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 160 + 819 = 975. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 61 × 17 = 1043. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 151 + 178 = 329. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 739 + 849 = 1588. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 74 × 43 = 3182. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 790 + 679 = 1469. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 747 + 670 = 1417. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 65 × 21 = 1365. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 44 × 80 = 3520. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 50 × 21 = 1057. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 31 × 55 = 1705. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 206 + 837 = 1051. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 19 × 99 = 1881. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 97 × 51 = 4947. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 61 × 90 = 5490. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 26 × 46 = 1194. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 76 × 50 = 3796. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 786 + 997 = 1782. Correct or wrong? (a) wrong (b) correct

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