Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 110 · 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: 325 + 715 = 1040. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 917 + 377 = 1294. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 50 × 16 = 800. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 99 × 81 = 8023. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 371 + 838 = 1212. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 30 × 38 = 1140. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 22 × 39 = 858. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 43 × 33 = 1419. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 60 × 42 = 2520. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 891 + 965 = 1856. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 98 × 17 = 1659. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 23 × 58 = 1340. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 44 × 68 = 2992. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 87 × 75 = 6525. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 970 + 319 = 1287. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 64 × 17 = 1088. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 403 + 526 = 922. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 288 + 780 = 1075. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 12 × 66 = 799. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 49 × 58 = 2838. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 478 + 151 = 629. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 43 × 61 = 2623. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 249 + 384 = 633. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 29 × 32 = 922. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 43 × 45 = 1932. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 64 × 72 = 4608. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 62 × 65 = 4030. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 682 + 784 = 1466. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 40 × 43 = 1720. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 812 + 741 = 1553. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 338 + 940 = 1280. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 53 × 36 = 1915. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 28 × 80 = 2241. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 51 × 98 = 4998. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 48 × 73 = 3507. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 714 + 315 = 1029. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 89 × 16 = 1424. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 88 × 72 = 6336. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 162 + 138 = 301. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 648 + 139 = 790. Correct or wrong? (a) wrong (b) correct

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