Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 567 · 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: 547 + 138 = 685. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 25 × 87 = 2176. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 426 + 571 = 990. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 181 + 788 = 977. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 417 + 854 = 1278. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 917 + 934 = 1850. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 75 × 36 = 2700. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 86 × 66 = 5676. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 91 × 82 = 7455. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 427 + 521 = 943. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 269 + 466 = 742. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 89 × 52 = 4628. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 62 × 15 = 926. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 43 × 91 = 3913. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 32 × 67 = 2144. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 843 + 707 = 1550. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 337 + 251 = 588. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 177 + 601 = 783. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 24 × 94 = 2256. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 68 × 74 = 5026. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 815 + 604 = 1419. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 86 × 19 = 1641. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 49 × 91 = 4459. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 338 + 291 = 631. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 93 × 95 = 8837. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 831 + 168 = 1007. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 399 + 741 = 1140. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 14 × 43 = 598. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 921 + 302 = 1223. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 878 + 869 = 1747. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 20 × 35 = 700. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 83 × 60 = 4980. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 25 × 74 = 1852. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 60 × 14 = 840. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 854 + 450 = 1308. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 121 + 835 = 950. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 43 × 29 = 1247. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 18 × 57 = 1022. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 27 × 22 = 594. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 14 × 96 = 1344. Correct or wrong? (a) correct (b) wrong

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