Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 106 · 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: 36 × 27 = 972. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 24 × 65 = 1560. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 70 × 26 = 1817. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 157 + 281 = 432. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 651 + 430 = 1086. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 19 × 20 = 380. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 78 × 68 = 5304. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 194 + 798 = 992. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 506 + 940 = 1446. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 609 + 575 = 1181. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 50 × 77 = 3847. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 68 × 66 = 4488. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 66 × 44 = 2898. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 858 + 883 = 1741. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 44 × 96 = 4216. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 461 + 997 = 1458. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 50 × 94 = 4697. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 444 + 877 = 1315. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 580 + 412 = 995. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 48 × 32 = 1537. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 78 × 81 = 6318. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 74 × 68 = 5032. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 19 × 71 = 1356. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 32 × 67 = 2144. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 215 + 875 = 1098. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 600 + 186 = 780. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 82 × 91 = 7464. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 885 + 879 = 1762. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 29 × 74 = 2145. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 862 + 584 = 1441. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 32 × 94 = 3008. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 257 + 477 = 734. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 149 + 514 = 656. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 641 + 166 = 809. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 30 × 79 = 2363. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 685 + 797 = 1482. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 24 × 61 = 1466. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 706 + 901 = 1604. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 68 × 44 = 2999. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 461 + 990 = 1451. Correct or wrong? (a) correct (b) wrong

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