Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 522 · 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: 67 × 13 = 863. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 328 + 161 = 495. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 18 × 75 = 1350. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 710 + 486 = 1196. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 73 × 12 = 876. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 93 × 54 = 5022. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 231 + 743 = 974. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 558 + 542 = 1100. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 299 + 790 = 1087. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 950 + 733 = 1683. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 858 + 646 = 1504. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 24 × 98 = 2352. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 38 × 80 = 3036. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 52 × 50 = 2600. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 71 × 87 = 6177. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 350 + 592 = 947. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 623 + 748 = 1371. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 654 + 588 = 1250. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 47 × 67 = 3149. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 51 × 54 = 2754. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 338 + 406 = 751. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 73 × 39 = 2853. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 651 + 965 = 1616. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 49 × 31 = 1523. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 291 + 148 = 445. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 16 × 80 = 1288. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 899 + 772 = 1671. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 30 × 26 = 780. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 281 + 826 = 1107. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 52 × 96 = 4996. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 24 × 35 = 840. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 601 + 432 = 1033. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 72 × 74 = 5328. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 157 + 431 = 588. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 980 + 957 = 1935. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 29 × 66 = 1906. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 42 × 61 = 2565. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 138 + 937 = 1075. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 13 × 57 = 741. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 85 × 38 = 3230. Correct or wrong? (a) correct (b) wrong

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