Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 939 · 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: 89 × 77 = 6859. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 77 × 63 = 4855. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 240 + 354 = 592. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 784 + 261 = 1044. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 481 + 744 = 1225. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 49 × 27 = 1318. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 38 × 98 = 3724. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 26 × 19 = 488. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 64 × 97 = 6208. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 19 × 23 = 441. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 182 + 125 = 307. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 769 + 626 = 1403. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 450 + 653 = 1103. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 76 × 13 = 987. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 494 + 930 = 1424. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 866 + 181 = 1047. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 845 + 139 = 984. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 57 × 47 = 2679. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 73 × 25 = 1833. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 59 × 27 = 1593. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 821 + 532 = 1353. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 387 + 153 = 540. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 237 + 270 = 507. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 12 × 70 = 840. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 67 × 64 = 4295. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 30 × 18 = 540. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 81 × 14 = 1141. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 82 × 12 = 982. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 160 + 508 = 661. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 20 × 38 = 760. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 54 × 43 = 2322. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 338 + 804 = 1142. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 271 + 863 = 1127. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 72 × 89 = 6408. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 244 + 188 = 432. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 82 × 93 = 7624. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 77 × 39 = 3003. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 681 + 412 = 1093. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 36 × 81 = 2916. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 538 + 439 = 977. Correct or wrong? (a) correct (b) wrong

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