Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 847 · 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: 441 + 382 = 823. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 60 × 64 = 3840. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 78 × 35 = 2724. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 50 × 60 = 3000. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 34 × 22 = 751. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 39 × 54 = 2102. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 577 + 221 = 794. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 99 × 97 = 9603. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 46 × 72 = 3312. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 54 × 45 = 2422. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 85 × 16 = 1360. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 28 × 20 = 557. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 480 + 665 = 1143. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 96 × 58 = 5576. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 483 + 314 = 799. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 24 × 42 = 1013. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 53 × 46 = 2443. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 169 + 877 = 1046. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 63 × 21 = 1323. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 221 + 351 = 575. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 150 + 617 = 767. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 18 × 49 = 875. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 76 × 74 = 5621. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 78 × 62 = 4836. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 56 × 78 = 4368. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 146 + 599 = 744. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 27 × 98 = 2646. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 99 × 94 = 9306. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 810 + 226 = 1036. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 668 + 885 = 1553. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 73 × 33 = 2409. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 37 × 33 = 1221. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 18 × 41 = 732. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 72 × 69 = 4968. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 836 + 742 = 1579. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 554 + 410 = 964. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 372 + 878 = 1251. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 72 × 61 = 4392. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 461 + 696 = 1157. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 31 × 36 = 1116. Correct or wrong? (a) correct (b) wrong

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