Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 929 · 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: 56 × 68 = 3816. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 26 × 54 = 1404. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 87 × 42 = 3654. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 187 + 270 = 457. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 469 + 201 = 676. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 419 + 152 = 571. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 208 + 833 = 1036. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 369 + 682 = 1054. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 50 × 99 = 4950. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 96 × 17 = 1628. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 205 + 360 = 564. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 58 × 52 = 3016. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 430 + 205 = 635. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 82 × 94 = 7708. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 483 + 406 = 889. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 311 + 122 = 433. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 896 + 595 = 1497. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 25 × 24 = 600. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 374 + 390 = 771. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 533 + 239 = 773. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 48 × 94 = 4505. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 636 + 785 = 1424. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 42 × 37 = 1554. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 22 × 82 = 1803. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 644 + 221 = 872. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 88 × 68 = 5978. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 69 × 55 = 3795. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 680 + 890 = 1572. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 363 + 514 = 877. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 773 + 412 = 1185. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 77 × 52 = 4004. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 57 × 21 = 1194. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 588 + 538 = 1133. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 31 × 94 = 2914. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 338 + 790 = 1130. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 607 + 554 = 1156. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 997 + 214 = 1211. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 815 + 590 = 1409. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 57 × 21 = 1197. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 57 × 35 = 1997. Correct or wrong? (a) correct (b) wrong

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