Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 429 · 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: 24 × 99 = 2368. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 89 × 31 = 2759. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 695 + 607 = 1302. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 266 + 936 = 1202. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 380 + 805 = 1185. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 278 + 537 = 817. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 46 × 60 = 2760. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 745 + 149 = 894. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 220 + 776 = 1000. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 45 × 34 = 1530. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 69 × 78 = 5385. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 291 + 401 = 692. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 807 + 205 = 1015. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 29 × 37 = 1073. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 34 × 94 = 3196. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 26 × 32 = 832. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 566 + 331 = 894. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 207 + 563 = 770. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 633 + 303 = 936. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 228 + 780 = 1012. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 209 + 559 = 761. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 212 + 393 = 609. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 989 + 158 = 1147. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 560 + 869 = 1427. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 365 + 685 = 1043. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 240 + 215 = 455. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 39 × 38 = 1482. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 60 × 24 = 1441. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 82 × 53 = 4346. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 60 × 37 = 2222. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 218 + 682 = 900. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 20 × 50 = 1005. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 905 + 209 = 1114. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 65 × 74 = 4807. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 458 + 575 = 1033. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 620 + 307 = 925. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 92 × 30 = 2760. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 90 × 61 = 5490. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 71 × 52 = 3692. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 65 × 63 = 4095. Correct or wrong? (a) wrong (b) correct

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