Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 4 · 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: 21 × 65 = 1365. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 14 × 32 = 442. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 922 + 448 = 1372. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 50 × 24 = 1200. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 12 × 37 = 444. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 342 + 788 = 1137. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 890 + 475 = 1364. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 223 + 614 = 831. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 83 × 57 = 4738. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 63 × 70 = 4410. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 436 + 160 = 604. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 54 × 77 = 4150. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 491 + 727 = 1218. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 18 × 70 = 1260. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 818 + 956 = 1774. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 937 + 331 = 1261. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 97 × 25 = 2426. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 977 + 392 = 1376. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 20 × 91 = 1820. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 164 + 325 = 492. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 42 × 83 = 3481. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 446 + 334 = 773. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 95 × 85 = 8075. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 306 + 790 = 1099. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 58 × 14 = 807. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 742 + 935 = 1677. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 59 × 14 = 826. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 52 × 65 = 3380. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 274 + 547 = 821. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 24 × 85 = 2048. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 51 × 96 = 4896. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 34 × 58 = 1969. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 931 + 826 = 1758. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 20 × 52 = 1037. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 69 × 87 = 6003. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 95 × 69 = 6553. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 152 + 926 = 1078. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 56 × 73 = 4088. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 430 + 813 = 1243. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 27 × 88 = 2380. Correct or wrong? (a) wrong (b) correct

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