Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 460 · 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: 425 + 970 = 1399. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 24 × 66 = 1584. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 859 + 613 = 1466. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 23 × 28 = 638. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 14 × 89 = 1246. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 277 + 507 = 784. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 986 + 748 = 1732. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 22 × 68 = 1492. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 89 × 76 = 6757. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 26 × 16 = 416. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 406 + 403 = 809. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 32 × 75 = 2400. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 46 × 35 = 1610. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 76 × 64 = 4864. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 18 × 53 = 959. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 14 × 95 = 1325. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 160 + 836 = 996. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 85 × 22 = 1870. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 498 + 988 = 1481. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 59 × 60 = 3532. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 65 × 28 = 1823. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 589 + 875 = 1467. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 852 + 224 = 1076. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 507 + 932 = 1436. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 70 × 67 = 4690. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 53 × 32 = 1689. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 53 × 16 = 848. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 59 × 51 = 3009. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 50 × 34 = 1701. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 30 × 23 = 690. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 526 + 811 = 1337. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 41 × 91 = 3731. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 67 × 80 = 5360. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 46 × 46 = 2116. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 84 × 27 = 2268. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 33 × 98 = 3230. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 352 + 649 = 996. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 874 + 254 = 1128. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 937 + 926 = 1862. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 537 + 944 = 1481. Correct or wrong? (a) wrong (b) correct

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