Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 734 · 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: 543 + 634 = 1174. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 209 + 586 = 788. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 20 × 55 = 1100. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 37 × 37 = 1368. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 55 × 35 = 1930. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 74 × 44 = 3249. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 266 + 525 = 785. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 778 + 531 = 1307. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 802 + 567 = 1372. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 512 + 265 = 777. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 600 + 510 = 1115. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 825 + 684 = 1517. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 72 × 32 = 2304. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 838 + 188 = 1032. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 25 × 48 = 1201. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 624 + 368 = 992. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 513 + 834 = 1347. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 58 × 70 = 4057. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 69 × 32 = 2215. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 250 + 929 = 1179. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 93 × 17 = 1581. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 371 + 415 = 786. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 319 + 355 = 678. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 38 × 38 = 1446. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 384 + 769 = 1146. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 15 × 12 = 177. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 652 + 121 = 773. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 23 × 38 = 872. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 952 + 744 = 1696. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 850 + 852 = 1702. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 36 × 46 = 1656. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 16 × 24 = 384. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 524 + 812 = 1336. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 83 × 20 = 1660. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 916 + 882 = 1798. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 505 + 214 = 719. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 32 × 87 = 2782. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 606 + 180 = 786. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 565 + 872 = 1437. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 609 + 746 = 1352. Correct or wrong? (a) wrong (b) correct

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