Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 900 · 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: 27 × 87 = 2349. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 49 × 61 = 2989. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 32 × 53 = 1696. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 173 + 258 = 426. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 34 × 59 = 2006. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 993 + 247 = 1242. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 546 + 147 = 692. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 554 + 612 = 1167. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 869 + 267 = 1134. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 838 + 126 = 964. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 22 × 51 = 1122. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 29 × 17 = 500. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 739 + 425 = 1156. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 19 × 69 = 1311. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 71 × 62 = 4404. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 639 + 996 = 1634. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 808 + 728 = 1536. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 41 × 35 = 1435. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 35 × 28 = 975. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 989 + 939 = 1928. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 94 × 77 = 7237. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 264 + 970 = 1234. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 276 + 506 = 788. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 397 + 622 = 1011. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 795 + 139 = 932. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 262 + 154 = 416. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 84 × 42 = 3536. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 81 × 16 = 1301. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 206 + 256 = 463. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 61 × 17 = 1033. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 359 + 823 = 1188. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 877 + 424 = 1301. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 373 + 463 = 844. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 325 + 479 = 804. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 934 + 234 = 1161. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 95 × 57 = 5417. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 78 × 64 = 4992. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 22 × 98 = 2155. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 294 + 294 = 588. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 804 + 975 = 1779. Correct or wrong? (a) correct (b) wrong

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