Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 8 · 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: 782 + 230 = 1012. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 923 + 317 = 1240. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 25 × 30 = 750. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 72 × 50 = 3606. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 625 + 861 = 1491. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 41 × 27 = 1108. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 16 × 68 = 1081. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 78 × 15 = 1170. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 581 + 354 = 935. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 459 + 932 = 1391. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 854 + 892 = 1746. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 388 + 977 = 1365. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 207 + 355 = 564. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 676 + 780 = 1456. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 198 + 749 = 954. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 70 × 69 = 4830. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 505 + 921 = 1426. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 97 × 65 = 6305. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 21 × 63 = 1328. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 568 + 271 = 839. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 66 × 13 = 861. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 41 × 16 = 660. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 87 × 70 = 6090. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 81 × 14 = 1130. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 987 + 832 = 1811. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 66 × 38 = 2514. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 27 × 60 = 1618. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 28 × 70 = 1960. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 19 × 38 = 723. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 33 × 35 = 1155. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 623 + 151 = 774. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 55 × 66 = 3630. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 73 × 83 = 6059. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 838 + 368 = 1203. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 50 × 21 = 1050. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 59 × 89 = 5255. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 606 + 707 = 1313. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 19 × 53 = 1014. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 63 × 15 = 949. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 17 × 31 = 527. Correct or wrong? (a) correct (b) wrong

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