Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 658 · 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: 76 × 22 = 1672. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 61 × 45 = 2744. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 772 + 122 = 893. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 636 + 906 = 1548. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 57 × 50 = 2854. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 44 × 90 = 3959. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 88 × 96 = 8448. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 882 + 415 = 1297. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 50 × 78 = 3901. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 64 × 20 = 1278. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 912 + 570 = 1490. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 501 + 538 = 1037. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 37 × 96 = 3552. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 33 × 24 = 792. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 74 × 46 = 3404. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 63 × 98 = 6174. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 12 × 42 = 504. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 926 + 633 = 1559. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 12 × 49 = 588. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 29 × 34 = 981. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 95 × 92 = 8741. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 75 × 88 = 6606. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 36 × 43 = 1553. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 55 × 78 = 4290. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 45 × 73 = 3285. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 909 + 163 = 1068. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 82 × 43 = 3526. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 25 × 49 = 1218. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 315 + 280 = 595. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 16 × 36 = 576. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 910 + 830 = 1740. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 263 + 808 = 1077. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 40 × 43 = 1728. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 328 + 199 = 527. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 249 + 506 = 755. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 891 + 134 = 1025. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 378 + 598 = 976. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 86 × 93 = 7998. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 54 × 75 = 4050. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 652 + 875 = 1527. Correct or wrong? (a) wrong (b) correct

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