Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 747 · 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: 184 + 830 = 1013. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 63 × 63 = 3971. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 846 + 453 = 1299. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 588 + 935 = 1530. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 144 + 726 = 870. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 335 + 266 = 607. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 72 × 59 = 4250. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 79 × 74 = 5854. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 38 × 96 = 3648. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 92 × 27 = 2485. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 50 × 70 = 3500. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 662 + 195 = 865. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 217 + 786 = 1003. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 206 + 145 = 356. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 21 × 55 = 1155. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 59 × 23 = 1352. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 18 × 29 = 524. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 354 + 232 = 586. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 592 + 916 = 1508. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 658 + 415 = 1073. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 88 × 15 = 1314. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 426 + 422 = 848. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 41 × 97 = 3969. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 954 + 362 = 1316. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 58 × 66 = 3828. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 12 × 21 = 256. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 70 × 81 = 5670. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 56 × 21 = 1176. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 154 + 181 = 335. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 789 + 391 = 1180. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 31 × 61 = 1891. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 65 × 71 = 4615. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 17 × 34 = 578. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 610 + 466 = 1076. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 650 + 317 = 964. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 85 × 19 = 1608. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 441 + 462 = 903. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 984 + 343 = 1325. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 194 + 529 = 723. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 25 × 44 = 1101. Correct or wrong? (a) correct (b) wrong

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