Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 923 · 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: 710 + 206 = 916. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 855 + 308 = 1158. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 731 + 414 = 1139. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 78 × 48 = 3743. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 46 × 33 = 1512. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 875 + 652 = 1522. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 71 × 52 = 3692. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 47 × 15 = 710. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 535 + 552 = 1087. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 650 + 639 = 1289. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 691 + 283 = 974. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 31 × 28 = 868. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 992 + 484 = 1481. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 29 × 79 = 2294. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 440 + 172 = 613. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 324 + 504 = 828. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 967 + 148 = 1118. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 98 × 55 = 5390. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 14 × 59 = 826. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 21 × 89 = 1869. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 916 + 568 = 1484. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 238 + 928 = 1166. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 631 + 452 = 1079. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 37 × 76 = 2810. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 31 × 12 = 374. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 19 × 35 = 666. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 84 × 42 = 3530. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 28 × 22 = 616. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 86 × 52 = 4479. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 17 × 55 = 935. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 92 × 29 = 2664. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 135 + 378 = 513. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 46 × 60 = 2760. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 17 × 19 = 326. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 797 + 782 = 1580. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 72 × 75 = 5400. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 86 × 14 = 1204. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 947 + 672 = 1619. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 744 + 533 = 1277. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 40 × 90 = 3600. Correct or wrong? (a) wrong (b) correct

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