Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 451 · 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: 776 + 607 = 1383. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 705 + 882 = 1587. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 60 × 77 = 4622. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 197 + 142 = 339. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 21 × 78 = 1638. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 81 × 28 = 2268. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 37 × 65 = 2405. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 20 × 22 = 440. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 34 × 92 = 3128. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 77 × 84 = 6472. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 169 + 407 = 582. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 25 × 27 = 675. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 136 + 693 = 829. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 15 × 31 = 465. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 355 + 989 = 1342. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 363 + 320 = 683. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 75 × 70 = 5250. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 94 × 39 = 3663. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 18 × 41 = 738. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 224 + 957 = 1181. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 89 × 23 = 2047. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 16 × 44 = 704. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 47 × 80 = 3758. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 250 + 625 = 875. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 38 × 69 = 2622. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 61 × 44 = 2684. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 31 × 24 = 744. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 153 + 875 = 1028. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 46 × 58 = 2668. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 31 × 63 = 1954. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 88 × 48 = 4230. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 43 × 37 = 1589. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 85 × 82 = 6962. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 31 × 36 = 1113. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 45 × 76 = 3420. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 163 + 125 = 288. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 93 × 76 = 7072. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 886 + 574 = 1467. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 36 × 36 = 1296. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 63 × 60 = 3780. Correct or wrong? (a) correct (b) wrong

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