Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 987 · 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: 68 × 75 = 5100. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 13 × 33 = 424. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 773 + 145 = 920. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 16 × 47 = 756. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 388 + 500 = 886. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 83 × 46 = 3818. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 29 × 25 = 725. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 39 × 29 = 1131. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 621 + 761 = 1382. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 18 × 35 = 630. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 95 × 16 = 1527. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 653 + 308 = 961. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 353 + 606 = 961. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 188 + 698 = 886. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 46 × 19 = 874. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 708 + 379 = 1087. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 25 × 42 = 1050. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 86 × 47 = 4042. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 90 × 97 = 8727. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 902 + 127 = 1029. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 65 × 71 = 4622. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 939 + 986 = 1926. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 81 × 12 = 969. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 765 + 595 = 1360. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 400 + 475 = 878. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 645 + 439 = 1084. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 63 × 26 = 1638. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 272 + 690 = 967. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 26 × 80 = 2072. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 52 × 64 = 3336. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 588 + 564 = 1152. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 783 + 187 = 972. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 70 × 38 = 2660. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 769 + 986 = 1755. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 33 × 69 = 2279. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 880 + 244 = 1116. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 32 × 92 = 2944. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 56 × 97 = 5432. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 225 + 581 = 806. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 14 × 42 = 590. Correct or wrong? (a) correct (b) wrong

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