Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 233 · 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: 61 × 60 = 3662. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 932 + 847 = 1786. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 417 + 328 = 749. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 840 + 508 = 1340. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 51 × 97 = 4942. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 642 + 998 = 1640. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 57 × 21 = 1197. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 65 × 30 = 1950. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 40 × 62 = 2476. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 890 + 944 = 1834. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 833 + 707 = 1540. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 69 × 19 = 1303. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 753 + 332 = 1085. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 15 × 46 = 690. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 71 × 86 = 6107. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 248 + 167 = 415. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 69 × 55 = 3797. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 317 + 387 = 710. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 53 × 66 = 3498. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 934 + 524 = 1463. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 85 × 22 = 1870. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 25 × 80 = 2001. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 812 + 909 = 1721. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 371 + 555 = 931. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 451 + 669 = 1117. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 793 + 271 = 1057. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 166 + 243 = 415. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 585 + 222 = 807. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 72 × 31 = 2239. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 960 + 142 = 1097. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 85 × 13 = 1099. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 41 × 43 = 1765. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 33 × 95 = 3134. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 70 × 82 = 5740. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 198 + 644 = 850. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 697 + 705 = 1409. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 897 + 174 = 1073. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 63 × 33 = 2084. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 83 × 47 = 3894. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 795 + 848 = 1643. Correct or wrong? (a) correct (b) wrong

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