Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 205 · 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: 95 × 35 = 3328. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 85 × 79 = 6708. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 891 + 414 = 1300. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 25 × 70 = 1750. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 893 + 459 = 1351. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 622 + 874 = 1496. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 291 + 781 = 1075. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 155 + 669 = 824. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 96 × 80 = 7680. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 99 × 78 = 7722. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 227 + 184 = 411. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 57 × 30 = 1710. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 535 + 550 = 1091. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 338 + 496 = 840. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 982 + 370 = 1348. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 567 + 135 = 702. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 736 + 862 = 1598. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 48 × 75 = 3600. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 131 + 184 = 315. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 347 + 599 = 953. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 58 × 34 = 1976. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 34 × 13 = 442. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 38 × 27 = 1018. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 691 + 760 = 1451. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 44 × 93 = 4095. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 32 × 24 = 768. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 200 + 138 = 336. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 238 + 813 = 1053. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 15 × 32 = 476. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 493 + 366 = 856. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 55 × 62 = 3410. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 92 × 62 = 5705. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 576 + 986 = 1568. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 14 × 37 = 517. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 964 + 987 = 1950. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 28 × 65 = 1828. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 84 × 81 = 6804. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 329 + 404 = 733. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 397 + 317 = 711. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 214 + 398 = 612. Correct or wrong? (a) correct (b) wrong

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