Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 360 · 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: 63 × 80 = 5040. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 43 × 78 = 3354. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 244 + 741 = 985. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 84 × 92 = 7728. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 31 × 52 = 1617. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 211 + 337 = 550. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 301 + 232 = 533. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 63 × 67 = 4225. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 310 + 844 = 1154. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 59 × 88 = 5198. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 23 × 31 = 713. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 20 × 53 = 1054. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 44 × 13 = 574. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 937 + 464 = 1401. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 201 + 263 = 461. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 736 + 674 = 1410. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 30 × 32 = 961. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 76 × 99 = 7524. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 913 + 241 = 1154. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 132 + 459 = 591. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 25 × 44 = 1103. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 81 × 96 = 7770. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 32 × 87 = 2784. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 943 + 729 = 1677. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 90 × 45 = 4043. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 74 × 64 = 4736. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 429 + 325 = 754. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 45 × 41 = 1845. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 94 × 96 = 9019. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 140 + 749 = 885. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 47 × 70 = 3293. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 371 + 211 = 582. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 74 × 66 = 4890. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 69 × 38 = 2616. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 152 + 502 = 654. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 359 + 439 = 800. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 474 + 135 = 609. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 677 + 345 = 1022. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 34 × 90 = 3061. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 80 × 85 = 6804. Correct or wrong? (a) wrong (b) correct

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