Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 993 · 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: 616 + 178 = 800. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 74 × 41 = 3029. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 94 × 71 = 6674. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 89 × 72 = 6415. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 794 + 809 = 1603. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 58 × 35 = 2031. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 360 + 377 = 736. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 78 × 18 = 1404. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 73 × 30 = 2190. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 697 + 823 = 1517. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 65 × 23 = 1502. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 832 + 890 = 1722. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 870 + 556 = 1426. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 63 × 86 = 5418. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 24 × 63 = 1512. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 891 + 490 = 1381. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 532 + 602 = 1134. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 183 + 961 = 1142. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 262 + 147 = 409. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 895 + 300 = 1197. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 488 + 769 = 1251. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 18 × 93 = 1681. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 80 × 88 = 7040. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 49 × 79 = 3871. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 83 × 86 = 7131. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 356 + 843 = 1202. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 60 × 39 = 2343. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 93 × 24 = 2236. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 46 × 31 = 1429. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 98 × 81 = 7938. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 13 × 69 = 897. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 27 × 73 = 1971. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 752 + 567 = 1319. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 44 × 44 = 1928. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 643 + 913 = 1560. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 91 × 75 = 6825. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 466 + 275 = 740. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 225 + 444 = 669. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 49 × 35 = 1709. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 87 × 50 = 4346. Correct or wrong? (a) wrong (b) correct

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