Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 399 · 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: 763 + 655 = 1420. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 90 × 77 = 6926. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 95 × 79 = 7505. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 567 + 797 = 1364. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 23 × 30 = 693. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 33 × 72 = 2368. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 242 + 643 = 885. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 398 + 814 = 1212. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 132 + 234 = 366. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 946 + 138 = 1084. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 609 + 170 = 779. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 42 × 37 = 1556. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 43 × 46 = 1985. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 18 × 24 = 440. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 369 + 249 = 618. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 90 × 55 = 4948. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 14 × 76 = 1072. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 84 × 76 = 6384. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 55 × 95 = 5217. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 32 × 80 = 2567. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 76 × 14 = 1071. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 661 + 655 = 1321. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 77 × 27 = 2079. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 40 × 64 = 2567. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 96 × 15 = 1446. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 359 + 784 = 1143. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 27 × 78 = 2111. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 92 × 79 = 7268. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 450 + 253 = 703. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 126 + 921 = 1045. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 930 + 212 = 1142. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 18 × 66 = 1188. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 75 × 18 = 1350. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 25 × 91 = 2269. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 77 × 81 = 6234. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 774 + 470 = 1245. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 592 + 648 = 1234. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 90 × 63 = 5670. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 34 × 40 = 1360. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 652 + 721 = 1379. Correct or wrong? (a) wrong (b) correct

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