Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 263 · 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: 77 × 55 = 4236. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 147 + 756 = 906. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 867 + 765 = 1632. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 984 + 287 = 1271. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 41 × 13 = 528. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 48 × 66 = 3174. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 313 + 317 = 622. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 35 × 16 = 561. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 882 + 950 = 1832. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 96 × 20 = 1920. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 73 × 32 = 2336. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 63 × 49 = 3088. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 57 × 88 = 5008. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 815 + 329 = 1148. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 371 + 459 = 830. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 889 + 609 = 1498. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 35 × 19 = 662. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 66 × 55 = 3630. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 295 + 959 = 1254. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 479 + 501 = 977. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 54 × 56 = 3024. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 56 × 85 = 4765. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 92 × 51 = 4692. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 245 + 589 = 833. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 355 + 746 = 1107. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 48 × 38 = 1824. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 136 + 856 = 986. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 36 × 17 = 612. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 90 × 97 = 8730. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 334 + 594 = 928. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 82 × 24 = 1968. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 311 + 183 = 490. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 791 + 256 = 1044. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 589 + 222 = 816. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 58 × 70 = 4061. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 974 + 978 = 1952. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 90 × 87 = 7830. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 40 × 34 = 1368. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 134 + 628 = 763. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 29 × 53 = 1540. Correct or wrong? (a) wrong (b) correct

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