Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 877 · 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: 46 × 28 = 1289. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 701 + 841 = 1541. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 54 × 87 = 4698. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 44 × 58 = 2552. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 695 + 301 = 995. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 67 × 36 = 2412. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 55 × 12 = 659. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 518 + 823 = 1344. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 441 + 472 = 916. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 32 × 50 = 1594. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 978 + 530 = 1509. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 698 + 277 = 975. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 32 × 83 = 2656. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 35 × 90 = 3145. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 19 × 25 = 475. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 43 × 12 = 516. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 36 × 24 = 864. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 266 + 328 = 588. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 66 × 94 = 6200. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 12 × 94 = 1133. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 319 + 206 = 520. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 23 × 31 = 713. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 13 × 26 = 338. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 24 × 15 = 360. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 40 × 97 = 3880. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 23 × 21 = 491. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 450 + 706 = 1156. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 208 + 937 = 1153. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 64 × 73 = 4676. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 83 × 41 = 3403. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 127 + 375 = 508. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 971 + 319 = 1290. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 73 × 59 = 4308. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 39 × 25 = 975. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 13 × 14 = 175. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 804 + 192 = 996. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 864 + 198 = 1062. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 908 + 232 = 1140. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 33 × 26 = 858. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 88 × 93 = 8192. Correct or wrong? (a) correct (b) wrong

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