Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 885 · 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: 67 × 53 = 3552. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 61 × 95 = 5795. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 698 + 341 = 1043. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 69 × 39 = 2691. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 37 × 77 = 2842. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 15 × 98 = 1470. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 19 × 20 = 372. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 51 × 88 = 4488. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 503 + 490 = 993. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 15 × 13 = 195. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 50 × 81 = 4056. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 411 + 176 = 588. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 47 × 59 = 2771. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 344 + 381 = 729. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 40 × 26 = 1044. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 347 + 170 = 521. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 25 × 18 = 451. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 61 × 22 = 1342. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 529 + 212 = 741. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 71 × 48 = 3408. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 819 + 152 = 969. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 243 + 293 = 530. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 297 + 307 = 608. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 98 × 14 = 1372. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 585 + 281 = 867. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 88 × 86 = 7574. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 55 × 43 = 2360. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 31 × 95 = 2949. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 750 + 183 = 926. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 264 + 346 = 610. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 792 + 648 = 1440. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 994 + 207 = 1203. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 78 × 13 = 1016. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 322 + 207 = 529. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 396 + 723 = 1120. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 55 × 44 = 2427. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 866 + 652 = 1518. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 254 + 764 = 1021. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 24 × 30 = 720. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 43 × 98 = 4214. Correct or wrong? (a) wrong (b) correct

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