Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 499 · 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: 47 × 14 = 658. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 36 × 25 = 900. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 25 × 25 = 625. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 727 + 178 = 905. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 77 × 36 = 2764. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 47 × 55 = 2589. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 73 × 13 = 949. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 53 × 72 = 3818. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 248 + 129 = 377. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 19 × 54 = 1032. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 594 + 855 = 1449. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 15 × 59 = 885. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 685 + 748 = 1431. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 14 × 25 = 350. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 18 × 75 = 1353. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 593 + 275 = 868. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 70 × 75 = 5245. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 741 + 188 = 921. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 686 + 787 = 1473. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 512 + 268 = 772. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 774 + 846 = 1620. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 68 × 96 = 6528. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 173 + 967 = 1140. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 47 × 27 = 1269. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 79 × 23 = 1816. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 48 × 37 = 1776. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 705 + 500 = 1205. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 95 × 12 = 1142. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 707 + 253 = 960. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 37 × 99 = 3663. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 209 + 627 = 836. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 61 × 54 = 3295. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 12 × 56 = 674. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 998 + 621 = 1616. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 652 + 811 = 1463. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 12 × 21 = 253. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 94 × 29 = 2729. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 999 + 137 = 1136. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 602 + 171 = 773. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 281 + 364 = 645. Correct or wrong? (a) wrong (b) correct

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