Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 692 · 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: 209 + 697 = 904. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 75 × 98 = 7350. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 55 × 40 = 2200. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 839 + 184 = 1023. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 881 + 882 = 1763. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 69 × 28 = 1932. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 298 + 578 = 876. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 53 × 94 = 4984. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 29 × 56 = 1624. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 149 + 531 = 687. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 875 + 904 = 1780. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 44 × 62 = 2720. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 659 + 764 = 1423. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 995 + 478 = 1473. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 70 × 47 = 3290. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 284 + 693 = 969. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 69 × 84 = 5796. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 19 × 17 = 323. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 68 × 54 = 3676. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 92 × 77 = 7087. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 84 × 68 = 5712. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 757 + 988 = 1745. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 41 × 38 = 1558. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 942 + 200 = 1142. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 93 × 18 = 1674. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 61 × 48 = 2928. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 54 × 93 = 5016. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 430 + 234 = 656. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 523 + 673 = 1195. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 86 × 37 = 3180. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 847 + 422 = 1274. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 87 × 94 = 8178. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 622 + 548 = 1170. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 58 × 78 = 4521. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 136 + 260 = 397. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 73 × 90 = 6570. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 50 × 16 = 800. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 57 × 78 = 4441. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 99 × 74 = 7322. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 745 + 379 = 1124. Correct or wrong? (a) correct (b) wrong

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