Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 115 · 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: 21 × 64 = 1344. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 334 + 164 = 494. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 44 × 18 = 792. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 265 + 136 = 400. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 167 + 218 = 386. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 59 × 28 = 1652. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 15 × 70 = 1050. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 67 × 68 = 4556. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 324 + 266 = 590. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 871 + 710 = 1583. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 266 + 660 = 926. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 971 + 428 = 1399. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 51 × 95 = 4845. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 120 + 709 = 833. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 703 + 859 = 1562. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 351 + 417 = 768. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 96 × 35 = 3352. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 614 + 209 = 831. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 22 × 87 = 1914. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 39 × 72 = 2811. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 18 × 33 = 595. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 657 + 148 = 798. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 40 × 71 = 2840. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 56 × 69 = 3864. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 541 + 975 = 1516. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 28 × 37 = 1036. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 56 × 86 = 4816. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 690 + 754 = 1437. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 595 + 914 = 1509. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 14 × 16 = 220. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 788 + 255 = 1043. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 96 × 44 = 4225. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 828 + 952 = 1774. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 99 × 20 = 1984. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 26 × 73 = 1898. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 351 + 345 = 695. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 869 + 877 = 1751. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 398 + 483 = 883. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 71 × 34 = 2414. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 389 + 978 = 1375. Correct or wrong? (a) wrong (b) correct

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