Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 135 · 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: 943 + 504 = 1447. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 31 × 46 = 1426. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 498 + 464 = 962. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 603 + 192 = 795. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 364 + 195 = 559. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 271 + 745 = 1016. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 200 + 709 = 909. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 62 × 61 = 3782. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 457 + 846 = 1307. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 58 × 96 = 5566. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 128 + 757 = 885. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 58 × 94 = 5452. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 28 × 40 = 1120. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 240 + 963 = 1203. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 517 + 670 = 1180. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 28 × 80 = 2240. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 45 × 14 = 622. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 14 × 76 = 1064. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 19 × 77 = 1461. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 25 × 90 = 2247. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 70 × 52 = 3645. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 21 × 18 = 382. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 617 + 559 = 1177. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 80 × 41 = 3280. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 581 + 467 = 1048. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 340 + 801 = 1141. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 860 + 568 = 1428. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 648 + 947 = 1594. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 22 × 70 = 1540. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 878 + 477 = 1355. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 649 + 184 = 833. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 80 × 43 = 3440. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 81 × 70 = 5670. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 22 × 23 = 506. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 120 + 907 = 1027. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 92 × 58 = 5335. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 843 + 717 = 1553. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 919 + 480 = 1399. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 33 × 61 = 2013. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 58 × 17 = 986. Correct or wrong? (a) wrong (b) correct

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