Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 309 · 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: 49 × 23 = 1131. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 414 + 270 = 680. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 60 × 81 = 4857. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 329 + 951 = 1280. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 21 × 79 = 1659. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 350 + 647 = 997. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 751 + 809 = 1560. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 65 × 93 = 6045. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 508 + 708 = 1216. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 52 × 28 = 1456. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 87 × 79 = 6873. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 62 × 63 = 3903. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 809 + 286 = 1095. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 694 + 911 = 1610. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 22 × 73 = 1608. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 737 + 833 = 1566. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 93 × 93 = 8656. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 36 × 97 = 3495. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 184 + 472 = 656. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 35 × 28 = 980. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 167 + 905 = 1072. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 651 + 737 = 1390. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 20 × 33 = 659. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 292 + 909 = 1193. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 32 × 29 = 932. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 66 × 22 = 1449. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 66 × 25 = 1644. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 142 + 373 = 515. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 74 × 66 = 4889. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 576 + 753 = 1321. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 83 × 16 = 1321. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 33 × 21 = 691. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 88 × 77 = 6776. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 56 × 61 = 3416. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 37 × 76 = 2812. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 172 + 811 = 983. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 89 × 23 = 2041. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 21 × 25 = 525. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 722 + 834 = 1564. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 899 + 160 = 1059. Correct or wrong? (a) correct (b) wrong

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