Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 889 · 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: 700 + 810 = 1510. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 24 × 55 = 1320. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 95 × 74 = 7030. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 814 + 841 = 1655. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 771 + 331 = 1102. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 88 × 64 = 5632. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 475 + 698 = 1181. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 22 × 66 = 1454. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 323 + 746 = 1072. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 58 × 68 = 3944. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 95 × 45 = 4275. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 306 + 572 = 878. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 68 × 26 = 1765. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 25 × 57 = 1425. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 71 × 80 = 5680. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 437 + 719 = 1150. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 16 × 58 = 928. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 13 × 55 = 715. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 888 + 608 = 1497. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 686 + 248 = 934. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 55 × 82 = 4510. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 33 × 32 = 1056. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 30 × 86 = 2577. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 560 + 205 = 769. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 608 + 250 = 858. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 40 × 32 = 1280. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 737 + 825 = 1562. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 29 × 28 = 812. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 65 × 76 = 4945. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 93 × 39 = 3631. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 92 × 77 = 7092. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 637 + 211 = 848. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 31 × 26 = 807. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 342 + 511 = 853. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 262 + 963 = 1225. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 615 + 386 = 1003. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 77 × 48 = 3697. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 223 + 852 = 1073. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 58 × 17 = 979. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 711 + 149 = 861. Correct or wrong? (a) correct (b) wrong

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