Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 488 · 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: 419 + 856 = 1275. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 744 + 223 = 967. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 91 × 17 = 1539. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 17 × 77 = 1309. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 929 + 132 = 1063. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 25 × 50 = 1254. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 28 × 46 = 1292. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 64 × 52 = 3336. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 957 + 612 = 1575. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 29 × 36 = 1044. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 93 × 62 = 5766. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 22 × 37 = 814. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 873 + 125 = 1003. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 29 × 81 = 2349. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 550 + 348 = 896. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 70 × 13 = 906. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 205 + 644 = 849. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 816 + 683 = 1504. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 23 × 57 = 1305. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 626 + 738 = 1364. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 133 + 516 = 649. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 65 × 64 = 4164. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 60 × 46 = 2759. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 239 + 172 = 411. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 211 + 640 = 848. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 817 + 487 = 1311. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 61 × 56 = 3416. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 837 + 155 = 987. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 32 × 17 = 547. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 68 × 96 = 6530. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 24 × 78 = 1878. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 368 + 218 = 589. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 843 + 589 = 1432. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 26 × 20 = 520. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 15 × 76 = 1144. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 19 × 42 = 792. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 130 + 376 = 511. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 14 × 18 = 252. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 84 × 90 = 7552. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 649 + 755 = 1404. Correct or wrong? (a) correct (b) wrong

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