Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 746 · 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: 147 + 428 = 583. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 905 + 866 = 1766. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 36 × 20 = 720. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 438 + 699 = 1134. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 48 × 59 = 2831. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 86 × 12 = 1032. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 544 + 811 = 1358. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 412 + 492 = 904. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 19 × 81 = 1539. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 62 × 94 = 5828. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 81 × 27 = 2195. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 197 + 629 = 826. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 63 × 25 = 1568. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 36 × 26 = 928. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 888 + 126 = 1014. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 75 × 76 = 5695. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 81 × 18 = 1460. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 18 × 96 = 1720. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 465 + 332 = 802. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 522 + 728 = 1250. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 57 × 67 = 3822. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 184 + 443 = 627. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 535 + 809 = 1344. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 25 × 48 = 1200. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 851 + 372 = 1223. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 145 + 346 = 491. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 47 × 33 = 1551. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 59 × 68 = 4012. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 59 × 72 = 4248. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 74 × 27 = 1995. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 566 + 702 = 1269. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 557 + 163 = 720. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 57 × 83 = 4730. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 96 × 18 = 1728. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 19 × 19 = 361. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 19 × 51 = 968. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 52 × 15 = 777. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 41 × 59 = 2419. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 29 × 44 = 1276. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 66 × 81 = 5342. Correct or wrong? (a) wrong (b) correct

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