Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 92 · 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: 27 × 21 = 567. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 822 + 338 = 1152. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 240 + 591 = 831. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 936 + 832 = 1768. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 841 + 581 = 1420. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 907 + 859 = 1767. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 598 + 595 = 1193. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 64 × 92 = 5888. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 171 + 175 = 338. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 34 × 70 = 2380. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 335 + 371 = 704. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 36 × 40 = 1439. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 494 + 560 = 1059. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 21 × 40 = 838. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 29 × 49 = 1429. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 49 × 67 = 3281. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 357 + 439 = 796. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 61 × 59 = 3604. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 81 × 16 = 1297. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 794 + 664 = 1458. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 283 + 895 = 1178. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 293 + 840 = 1133. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 788 + 471 = 1259. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 550 + 444 = 987. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 196 + 659 = 852. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 31 × 75 = 2327. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 243 + 551 = 797. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 46 × 16 = 736. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 390 + 838 = 1230. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 60 × 76 = 4562. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 16 × 41 = 656. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 418 + 826 = 1243. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 78 × 89 = 6949. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 563 + 574 = 1137. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 42 × 92 = 3864. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 49 × 89 = 4361. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 12 × 60 = 720. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 24 × 32 = 768. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 495 + 697 = 1192. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 24 × 21 = 499. Correct or wrong? (a) wrong (b) correct

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