Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 942 · 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: 367 + 925 = 1292. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 26 × 58 = 1508. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 85 × 13 = 1110. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 85 × 71 = 6039. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 92 × 73 = 6716. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 71 × 62 = 4402. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 76 × 40 = 3040. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 42 × 99 = 4158. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 656 + 686 = 1335. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 91 × 83 = 7551. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 363 + 816 = 1184. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 23 × 74 = 1702. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 512 + 726 = 1238. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 79 × 33 = 2612. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 86 × 50 = 4300. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 19 × 40 = 760. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 95 × 59 = 5612. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 91 × 82 = 7469. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 46 × 41 = 1886. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 93 × 19 = 1767. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 151 + 303 = 454. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 863 + 995 = 1858. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 249 + 233 = 482. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 351 + 353 = 704. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 753 + 586 = 1342. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 73 × 88 = 6425. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 27 × 48 = 1296. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 24 × 32 = 770. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 135 + 663 = 799. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 17 × 23 = 397. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 68 × 51 = 3476. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 657 + 308 = 958. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 376 + 758 = 1132. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 34 × 53 = 1799. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 485 + 157 = 637. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 218 + 255 = 473. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 69 × 79 = 5451. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 44 × 18 = 792. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 24 × 91 = 2184. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 353 + 250 = 603. Correct or wrong? (a) wrong (b) correct

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