Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 782 · 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: 259 + 623 = 875. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 939 + 258 = 1197. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 29 × 69 = 2001. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 18 × 96 = 1728. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 80 × 47 = 3758. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 57 × 15 = 855. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 637 + 823 = 1467. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 667 + 803 = 1470. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 402 + 706 = 1108. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 645 + 143 = 786. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 58 × 21 = 1218. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 52 × 24 = 1248. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 71 × 26 = 1846. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 81 × 89 = 7209. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 56 × 14 = 786. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 99 × 33 = 3271. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 59 × 97 = 5723. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 591 + 350 = 947. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 90 × 64 = 5762. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 237 + 839 = 1078. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 261 + 303 = 564. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 21 × 77 = 1611. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 59 × 30 = 1770. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 405 + 607 = 1005. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 638 + 124 = 762. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 43 × 81 = 3483. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 89 × 13 = 1157. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 30 × 50 = 1500. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 77 × 55 = 4235. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 28 × 74 = 2068. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 38 × 46 = 1748. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 13 × 64 = 832. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 36 × 68 = 2451. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 55 × 23 = 1265. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 29 × 88 = 2552. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 443 + 457 = 900. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 41 × 91 = 3731. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 482 + 207 = 689. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 98 × 55 = 5390. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 60 × 65 = 3896. Correct or wrong? (a) wrong (b) correct

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