Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 152 · 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: 220 + 824 = 1044. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 28 × 68 = 1903. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 78 × 71 = 5535. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 742 + 693 = 1435. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 16 × 32 = 512. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 48 × 80 = 3840. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 835 + 514 = 1349. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 52 × 79 = 4102. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 25 × 72 = 1800. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 495 + 200 = 693. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 61 × 29 = 1769. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 484 + 632 = 1119. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 59 × 59 = 3481. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 326 + 647 = 976. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 256 + 906 = 1162. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 419 + 800 = 1219. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 85 × 78 = 6630. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 70 × 75 = 5251. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 875 + 150 = 1026. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 335 + 893 = 1223. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 437 + 304 = 741. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 98 × 81 = 7938. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 53 × 46 = 2438. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 26 × 18 = 468. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 727 + 776 = 1499. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 92 × 98 = 9008. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 40 × 54 = 2165. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 687 + 163 = 852. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 62 × 92 = 5704. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 920 + 835 = 1755. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 652 + 236 = 888. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 369 + 383 = 751. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 94 × 43 = 4050. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 179 + 981 = 1160. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 54 × 81 = 4368. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 80 × 58 = 4645. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 389 + 638 = 1027. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 511 + 574 = 1090. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 342 + 201 = 543. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 785 + 176 = 957. Correct or wrong? (a) correct (b) wrong

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