Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 190 · 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: 41 × 17 = 697. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 70 × 21 = 1470. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 26 × 39 = 1014. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 76 × 36 = 2736. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 18 × 85 = 1527. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 43 × 84 = 3607. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 160 + 428 = 588. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 82 × 87 = 7134. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 834 + 971 = 1811. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 55 × 23 = 1265. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 91 × 87 = 7917. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 74 × 40 = 2962. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 16 × 32 = 510. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 97 × 26 = 2530. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 188 + 156 = 337. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 62 × 39 = 2410. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 77 × 29 = 2226. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 96 × 12 = 1152. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 84 × 50 = 4200. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 462 + 983 = 1452. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 17 × 93 = 1581. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 75 × 38 = 2852. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 623 + 142 = 768. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 51 × 21 = 1071. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 706 + 346 = 1052. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 40 × 43 = 1720. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 38 × 97 = 3687. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 412 + 269 = 686. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 720 + 955 = 1667. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 42 × 90 = 3784. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 54 × 70 = 3780. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 98 × 43 = 4207. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 58 × 86 = 4982. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 26 × 70 = 1820. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 577 + 200 = 777. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 533 + 130 = 658. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 207 + 398 = 603. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 15 × 39 = 583. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 448 + 281 = 729. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 14 × 47 = 658. Correct or wrong? (a) correct (b) wrong

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