Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 2 · 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: 63 × 28 = 1764. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 305 + 267 = 572. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 97 × 98 = 9506. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 141 + 366 = 507. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 301 + 927 = 1228. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 564 + 842 = 1403. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 23 × 29 = 667. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 83 × 22 = 1832. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 36 × 73 = 2628. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 243 + 958 = 1199. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 44 × 36 = 1584. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 218 + 512 = 729. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 361 + 658 = 1019. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 797 + 394 = 1191. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 34 × 88 = 2992. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 73 × 69 = 5044. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 89 × 27 = 2403. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 539 + 289 = 828. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 17 × 36 = 605. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 731 + 771 = 1502. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 277 + 247 = 524. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 30 × 16 = 480. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 697 + 894 = 1591. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 72 × 33 = 2376. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 89 × 65 = 5785. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 43 × 83 = 3567. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 75 × 50 = 3752. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 61 × 40 = 2445. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 48 × 60 = 2880. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 44 × 84 = 3694. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 28 × 36 = 1008. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 893 + 702 = 1590. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 536 + 825 = 1354. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 15 × 25 = 375. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 50 × 19 = 947. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 95 × 23 = 2186. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 511 + 848 = 1359. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 159 + 780 = 947. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 88 × 83 = 7304. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 21 × 85 = 1785. Correct or wrong? (a) correct (b) wrong

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