Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 268 · 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: 131 + 366 = 504. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 341 + 651 = 993. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 99 × 92 = 9108. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 84 × 96 = 8064. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 63 × 57 = 3590. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 606 + 799 = 1405. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 136 + 187 = 323. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 975 + 745 = 1720. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 36 × 92 = 3312. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 997 + 919 = 1911. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 36 × 37 = 1332. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 936 + 255 = 1191. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 43 × 13 = 561. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 27 × 32 = 859. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 618 + 606 = 1224. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 713 + 653 = 1358. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 637 + 580 = 1217. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 466 + 739 = 1205. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 29 × 35 = 1023. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 207 + 246 = 461. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 160 + 561 = 722. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 480 + 921 = 1401. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 171 + 864 = 1035. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 872 + 697 = 1576. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 99 × 38 = 3762. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 641 + 360 = 1001. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 19 × 39 = 739. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 75 × 40 = 2999. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 88 × 18 = 1592. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 301 + 854 = 1151. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 291 + 661 = 951. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 77 × 59 = 4545. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 464 + 886 = 1350. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 85 × 71 = 6034. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 38 × 49 = 1862. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 81 × 98 = 7939. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 57 × 90 = 5123. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 314 + 233 = 539. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 199 + 690 = 884. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 92 × 79 = 7270. Correct or wrong? (a) correct (b) wrong

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