Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 764 · 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: 770 + 905 = 1675. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 25 × 98 = 2450. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 873 + 562 = 1439. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 99 × 18 = 1776. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 97 × 40 = 3880. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 33 × 26 = 858. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 355 + 945 = 1305. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 63 × 15 = 944. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 49 × 90 = 4410. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 81 × 60 = 4858. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 346 + 630 = 968. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 75 × 82 = 6146. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 70 × 95 = 6650. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 58 × 28 = 1624. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 155 + 762 = 916. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 95 × 97 = 9212. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 267 + 995 = 1262. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 80 × 83 = 6640. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 94 × 79 = 7426. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 44 × 89 = 3916. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 24 × 23 = 552. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 316 + 466 = 780. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 27 × 20 = 540. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 41 × 78 = 3198. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 80 × 47 = 3760. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 34 × 81 = 2754. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 478 + 723 = 1201. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 57 × 96 = 5472. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 24 × 67 = 1612. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 992 + 345 = 1337. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 83 × 78 = 6475. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 50 × 74 = 3701. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 574 + 270 = 844. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 788 + 547 = 1335. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 153 + 195 = 348. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 15 × 21 = 315. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 229 + 877 = 1106. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 127 + 895 = 1015. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 70 × 65 = 4555. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 248 + 360 = 608. Correct or wrong? (a) correct (b) wrong

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