Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 479 · 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: 664 + 907 = 1571. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 617 + 451 = 1068. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 24 × 50 = 1208. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 344 + 877 = 1221. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 230 + 625 = 855. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 85 × 39 = 3315. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 64 × 12 = 766. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 409 + 771 = 1180. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 48 × 88 = 4224. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 62 × 41 = 2545. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 47 × 69 = 3240. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 658 + 809 = 1474. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 17 × 93 = 1581. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 733 + 167 = 899. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 13 × 98 = 1274. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 234 + 901 = 1139. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 973 + 977 = 1951. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 98 × 46 = 4508. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 88 × 22 = 1936. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 854 + 835 = 1689. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 563 + 471 = 1035. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 43 × 81 = 3483. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 23 × 26 = 598. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 77 × 27 = 2077. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 188 + 445 = 633. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 27 × 89 = 2406. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 864 + 312 = 1176. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 499 + 721 = 1212. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 95 × 30 = 2856. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 67 × 66 = 4418. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 684 + 302 = 986. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 21 × 41 = 861. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 378 + 439 = 817. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 34 × 81 = 2754. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 594 + 194 = 788. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 33 × 52 = 1715. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 67 × 20 = 1340. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 24 × 60 = 1448. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 29 × 18 = 529. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 478 + 256 = 731. Correct or wrong? (a) wrong (b) correct

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