Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 960 · 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: 381 + 571 = 948. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 78 × 64 = 4992. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 39 × 22 = 858. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 86 × 93 = 7998. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 973 + 228 = 1201. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 323 + 739 = 1062. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 12 × 77 = 916. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 35 × 95 = 3325. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 15 × 61 = 915. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 52 × 89 = 4628. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 320 + 556 = 873. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 63 × 96 = 6056. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 29 × 41 = 1189. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 619 + 453 = 1070. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 899 + 653 = 1552. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 77 × 38 = 2922. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 564 + 440 = 1011. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 16 × 22 = 352. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 910 + 150 = 1065. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 83 × 97 = 8051. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 68 × 26 = 1766. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 366 + 198 = 572. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 95 × 66 = 6270. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 96 × 83 = 7966. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 26 × 17 = 442. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 903 + 337 = 1240. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 28 × 87 = 2436. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 20 × 27 = 535. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 64 × 18 = 1144. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 890 + 150 = 1040. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 17 × 65 = 1105. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 853 + 608 = 1458. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 85 × 88 = 7477. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 90 × 83 = 7470. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 15 × 83 = 1245. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 58 × 20 = 1160. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 829 + 801 = 1634. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 50 × 31 = 1550. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 45 × 67 = 3019. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 89 × 27 = 2408. Correct or wrong? (a) wrong (b) correct

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