Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 536 · 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: 580 + 536 = 1108. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 154 + 952 = 1106. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 397 + 729 = 1120. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 85 × 38 = 3230. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 33 × 49 = 1617. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 812 + 346 = 1158. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 66 × 21 = 1384. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 62 × 33 = 2046. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 32 × 53 = 1696. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 343 + 152 = 495. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 70 × 99 = 6930. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 340 + 172 = 515. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 457 + 415 = 874. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 77 × 59 = 4536. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 93 × 55 = 5115. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 39 × 64 = 2496. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 98 × 88 = 8624. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 321 + 266 = 587. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 64 × 69 = 4418. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 31 × 27 = 836. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 63 × 32 = 2016. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 15 × 84 = 1260. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 52 × 42 = 2184. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 70 × 18 = 1260. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 30 × 67 = 2008. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 821 + 584 = 1405. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 405 + 177 = 582. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 53 × 37 = 1957. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 26 × 38 = 991. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 634 + 966 = 1601. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 82 × 19 = 1558. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 349 + 742 = 1091. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 44 × 14 = 623. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 28 × 70 = 1958. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 87 × 47 = 4087. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 576 + 260 = 836. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 745 + 323 = 1068. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 88 × 19 = 1672. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 51 × 92 = 4692. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 79 × 62 = 4898. Correct or wrong? (a) wrong (b) correct

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