Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 250 · 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: 253 + 523 = 776. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 37 × 54 = 1998. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 76 × 44 = 3342. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 39 × 31 = 1207. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 242 + 384 = 629. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 37 × 15 = 553. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 966 + 888 = 1852. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 987 + 388 = 1375. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 43 × 70 = 3010. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 374 + 399 = 774. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 51 × 51 = 2601. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 333 + 128 = 465. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 548 + 816 = 1365. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 28 × 96 = 2688. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 53 × 39 = 2064. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 241 + 592 = 828. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 51 × 79 = 4029. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 827 + 487 = 1314. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 544 + 296 = 840. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 38 × 25 = 950. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 73 × 39 = 2850. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 564 + 830 = 1394. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 599 + 732 = 1329. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 417 + 775 = 1192. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 496 + 300 = 802. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 26 × 66 = 1710. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 29 × 92 = 2676. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 690 + 544 = 1234. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 565 + 323 = 894. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 182 + 725 = 905. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 782 + 125 = 911. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 969 + 292 = 1261. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 46 × 38 = 1748. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 137 + 935 = 1072. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 826 + 219 = 1045. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 216 + 455 = 676. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 665 + 539 = 1204. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 855 + 493 = 1353. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 881 + 408 = 1289. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 720 + 793 = 1513. Correct or wrong? (a) wrong (b) correct

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