Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 134 · 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: 520 + 820 = 1340. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 41 × 65 = 2665. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 61 × 94 = 5734. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 96 × 25 = 2400. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 49 × 21 = 1036. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 56 × 57 = 3195. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 285 + 980 = 1272. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 45 × 65 = 2925. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 579 + 303 = 882. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 54 × 19 = 1026. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 166 + 212 = 378. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 123 + 987 = 1110. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 313 + 588 = 901. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 75 × 54 = 4050. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 83 × 12 = 996. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 921 + 659 = 1576. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 446 + 367 = 813. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 20 × 21 = 420. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 30 × 36 = 1072. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 38 × 20 = 759. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 19 × 49 = 935. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 69 × 66 = 4554. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 682 + 334 = 1014. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 306 + 387 = 685. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 877 + 398 = 1272. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 79 × 75 = 5932. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 577 + 639 = 1216. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 818 + 995 = 1820. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 46 × 66 = 3036. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 39 × 53 = 2065. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 63 × 90 = 5670. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 91 × 78 = 7098. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 256 + 171 = 427. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 417 + 720 = 1137. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 333 + 122 = 456. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 38 × 55 = 2090. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 377 + 429 = 806. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 98 × 35 = 3430. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 158 + 919 = 1074. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 37 × 51 = 1887. Correct or wrong? (a) wrong (b) correct

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