Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 427 · 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: 60 × 84 = 5037. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 71 × 50 = 3550. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 98 × 96 = 9411. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 337 + 473 = 810. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 83 × 40 = 3314. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 62 × 93 = 5770. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 88 × 31 = 2728. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 238 + 477 = 715. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 486 + 793 = 1285. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 333 + 146 = 483. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 62 × 50 = 3107. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 894 + 550 = 1442. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 748 + 223 = 971. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 32 × 33 = 1056. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 42 × 95 = 3990. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 614 + 498 = 1112. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 484 + 642 = 1120. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 45 × 56 = 2520. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 90 × 29 = 2605. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 55 × 32 = 1766. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 86 × 64 = 5504. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 355 + 412 = 768. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 69 × 47 = 3237. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 710 + 477 = 1187. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 16 × 77 = 1228. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 43 × 32 = 1369. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 75 × 91 = 6825. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 672 + 236 = 908. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 971 + 255 = 1226. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 68 × 27 = 1840. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 70 × 97 = 6782. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 289 + 244 = 533. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 61 × 30 = 1830. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 60 × 49 = 2940. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 774 + 203 = 970. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 22 × 56 = 1232. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 82 × 57 = 4674. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 383 + 763 = 1146. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 841 + 552 = 1393. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 79 × 66 = 5214. Correct or wrong? (a) correct (b) wrong

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