Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 416 · 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: 921 + 797 = 1718. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 988 + 635 = 1623. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 38 × 25 = 950. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 566 + 934 = 1507. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 54 × 85 = 4590. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 80 × 35 = 2804. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 845 + 865 = 1710. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 44 × 97 = 4268. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 987 + 846 = 1831. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 64 × 59 = 3769. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 42 × 70 = 2941. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 12 × 68 = 817. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 148 + 516 = 664. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 186 + 624 = 816. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 66 × 17 = 1122. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 63 × 48 = 3024. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 298 + 809 = 1112. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 41 × 33 = 1357. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 832 + 398 = 1230. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 15 × 56 = 835. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 236 + 373 = 609. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 405 + 765 = 1170. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 15 × 48 = 720. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 86 × 55 = 4730. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 40 × 18 = 720. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 533 + 497 = 1030. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 17 × 34 = 578. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 120 + 978 = 1098. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 421 + 219 = 640. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 23 × 24 = 552. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 533 + 524 = 1057. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 19 × 57 = 1088. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 861 + 120 = 986. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 73 × 50 = 3650. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 84 × 79 = 6633. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 226 + 791 = 1016. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 24 × 32 = 775. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 34 × 83 = 2814. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 54 × 97 = 5232. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 553 + 590 = 1143. Correct or wrong? (a) wrong (b) correct

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