Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 670 · 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: 832 + 240 = 1072. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 32 × 39 = 1248. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 49 × 63 = 3088. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 55 × 68 = 3745. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 35 × 77 = 2700. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 822 + 197 = 1019. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 32 × 42 = 1344. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 808 + 479 = 1287. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 777 + 869 = 1646. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 277 + 702 = 984. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 75 × 49 = 3671. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 65 × 15 = 975. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 761 + 190 = 950. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 648 + 605 = 1253. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 230 + 677 = 901. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 64 × 78 = 4992. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 25 × 97 = 2425. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 13 × 21 = 273. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 72 × 90 = 6480. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 942 + 853 = 1795. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 73 × 55 = 4009. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 24 × 72 = 1728. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 228 + 236 = 464. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 944 + 866 = 1810. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 49 × 35 = 1715. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 62 × 44 = 2728. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 34 × 64 = 2176. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 598 + 854 = 1452. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 74 × 41 = 3034. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 89 × 97 = 8633. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 374 + 973 = 1347. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 629 + 763 = 1392. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 25 × 77 = 1925. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 73 × 85 = 6205. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 192 + 213 = 404. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 12 × 19 = 228. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 590 + 243 = 833. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 16 × 38 = 608. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 22 × 81 = 1782. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 33 × 83 = 2739. Correct or wrong? (a) wrong (b) correct

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