Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 242 · 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: 81 × 95 = 7693. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 15 × 58 = 870. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 394 + 670 = 1064. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 127 + 657 = 784. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 145 + 938 = 1077. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 789 + 191 = 980. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 127 + 444 = 571. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 985 + 469 = 1458. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 23 × 59 = 1357. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 98 × 79 = 7742. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 18 × 88 = 1584. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 168 + 121 = 290. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 932 + 283 = 1222. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 474 + 761 = 1229. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 31 × 28 = 865. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 28 × 32 = 903. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 26 × 58 = 1508. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 29 × 82 = 2385. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 89 × 37 = 3293. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 731 + 712 = 1443. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 14 × 26 = 364. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 511 + 210 = 721. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 252 + 343 = 601. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 439 + 267 = 706. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 832 + 512 = 1347. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 47 × 22 = 1034. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 27 × 39 = 1053. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 21 × 70 = 1470. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 369 + 804 = 1181. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 329 + 804 = 1135. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 661 + 423 = 1084. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 601 + 840 = 1443. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 98 × 22 = 2156. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 912 + 843 = 1757. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 219 + 739 = 958. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 50 × 70 = 3500. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 18 × 37 = 666. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 333 + 530 = 866. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 294 + 124 = 418. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 610 + 586 = 1189. Correct or wrong? (a) wrong (b) correct

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