Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 266 · 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: 445 + 904 = 1348. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 592 + 910 = 1497. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 88 × 33 = 2904. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 95 × 16 = 1520. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 716 + 580 = 1296. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 79 × 47 = 3711. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 45 × 47 = 2115. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 22 × 40 = 883. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 816 + 872 = 1690. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 94 × 23 = 2162. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 371 + 683 = 1046. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 81 × 92 = 7452. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 77 × 27 = 2079. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 81 × 81 = 6562. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 75 × 76 = 5700. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 810 + 153 = 965. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 76 × 23 = 1743. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 87 × 12 = 1049. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 710 + 236 = 946. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 571 + 295 = 869. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 145 + 894 = 1039. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 812 + 834 = 1653. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 86 × 59 = 5077. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 570 + 692 = 1262. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 57 × 20 = 1140. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 367 + 356 = 715. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 97 × 64 = 6207. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 663 + 922 = 1585. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 142 + 920 = 1069. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 21 × 69 = 1452. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 13 × 15 = 199. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 30 × 17 = 514. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 196 + 844 = 1043. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 701 + 255 = 949. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 87 × 65 = 5653. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 34 × 87 = 2958. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 57 × 13 = 749. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 21 × 79 = 1654. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 262 + 702 = 963. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 246 + 172 = 413. Correct or wrong? (a) correct (b) wrong

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