Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 253 · 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: 996 + 883 = 1879. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 94 × 34 = 3196. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 23 × 92 = 2119. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 950 + 125 = 1073. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 80 × 43 = 3440. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 60 × 92 = 5514. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 51 × 88 = 4493. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 537 + 475 = 1012. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 51 × 20 = 1028. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 374 + 695 = 1068. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 41 × 48 = 1976. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 764 + 850 = 1614. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 683 + 249 = 932. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 26 × 30 = 780. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 30 × 78 = 2340. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 755 + 840 = 1597. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 778 + 816 = 1594. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 23 × 42 = 966. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 21 × 81 = 1701. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 681 + 331 = 1015. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 31 × 33 = 1019. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 315 + 701 = 1016. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 18 × 53 = 954. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 499 + 341 = 840. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 45 × 43 = 1935. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 304 + 491 = 795. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 576 + 191 = 767. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 475 + 626 = 1101. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 257 + 157 = 414. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 956 + 972 = 1924. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 709 + 333 = 1042. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 90 × 63 = 5664. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 58 × 40 = 2320. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 84 × 12 = 1015. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 91 × 75 = 6825. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 725 + 238 = 963. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 28 × 84 = 2352. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 477 + 662 = 1139. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 82 × 35 = 2870. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 27 × 80 = 2160. Correct or wrong? (a) wrong (b) correct

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