Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 661 · 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: 701 + 654 = 1355. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 30 × 17 = 510. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 60 × 27 = 1614. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 952 + 300 = 1252. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 31 × 58 = 1790. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 69 × 37 = 2553. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 428 + 682 = 1110. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 37 × 54 = 1998. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 998 + 712 = 1710. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 80 × 34 = 2720. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 98 × 16 = 1562. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 77 × 66 = 5082. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 83 × 84 = 6972. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 249 + 192 = 441. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 241 + 782 = 1022. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 60 × 79 = 4748. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 46 × 48 = 2212. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 978 + 559 = 1537. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 78 × 14 = 1088. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 369 + 679 = 1048. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 47 × 45 = 2115. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 15 × 34 = 510. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 608 + 290 = 898. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 75 × 16 = 1200. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 76 × 13 = 988. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 508 + 344 = 851. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 541 + 172 = 713. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 782 + 602 = 1384. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 819 + 911 = 1730. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 446 + 133 = 579. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 705 + 678 = 1383. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 903 + 769 = 1670. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 31 × 36 = 1116. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 204 + 434 = 638. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 59 × 36 = 2127. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 40 × 38 = 1524. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 260 + 632 = 899. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 864 + 350 = 1214. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 364 + 769 = 1133. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 124 + 687 = 808. Correct or wrong? (a) wrong (b) correct

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