Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 627 · 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: 268 + 332 = 600. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 688 + 794 = 1482. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 449 + 353 = 804. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 499 + 416 = 921. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 13 × 97 = 1261. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 65 × 32 = 2076. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 24 × 29 = 696. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 345 + 622 = 964. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 200 + 436 = 639. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 42 × 91 = 3822. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 37 × 47 = 1734. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 71 × 55 = 3907. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 19 × 28 = 533. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 16 × 15 = 242. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 914 + 338 = 1252. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 16 × 81 = 1296. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 319 + 273 = 592. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 71 × 38 = 2698. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 228 + 642 = 870. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 221 + 357 = 586. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 251 + 425 = 675. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 17 × 60 = 1020. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 39 × 80 = 3120. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 650 + 485 = 1135. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 85 × 44 = 3732. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 81 × 22 = 1782. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 689 + 166 = 853. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 64 × 92 = 5895. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 63 × 79 = 4977. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 62 × 79 = 4890. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 382 + 712 = 1100. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 779 + 149 = 930. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 217 + 739 = 953. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 398 + 730 = 1128. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 60 × 95 = 5698. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 58 × 62 = 3596. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 748 + 211 = 959. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 83 × 37 = 3073. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 60 × 74 = 4441. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 27 × 15 = 400. Correct or wrong? (a) correct (b) wrong

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