Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 71 · 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: 887 + 164 = 1051. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 533 + 631 = 1156. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 239 + 375 = 614. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 88 × 30 = 2637. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 79 × 27 = 2133. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 85 × 83 = 7054. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 52 × 32 = 1664. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 259 + 155 = 408. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 998 + 722 = 1720. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 527 + 839 = 1374. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 43 × 63 = 2709. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 70 × 93 = 6505. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 496 + 307 = 803. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 163 + 916 = 1076. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 465 + 878 = 1338. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 669 + 168 = 833. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 18 × 46 = 833. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 64 × 25 = 1600. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 77 × 90 = 6930. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 791 + 356 = 1147. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 268 + 529 = 797. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 28 × 24 = 672. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 777 + 645 = 1422. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 71 × 90 = 6395. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 507 + 574 = 1081. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 83 × 97 = 8052. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 21 × 68 = 1431. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 934 + 220 = 1154. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 19 × 65 = 1235. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 35 × 86 = 3010. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 536 + 889 = 1419. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 13 × 69 = 897. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 341 + 783 = 1123. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 432 + 821 = 1249. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 569 + 284 = 848. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 17 × 84 = 1428. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 44 × 17 = 749. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 886 + 698 = 1584. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 43 × 14 = 602. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 307 + 784 = 1091. Correct or wrong? (a) correct (b) wrong

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