Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 277 · 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: 48 × 56 = 2680. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 808 + 721 = 1529. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 73 × 37 = 2701. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 39 × 44 = 1724. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 798 + 227 = 1025. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 77 × 68 = 5236. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 448 + 340 = 794. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 526 + 658 = 1179. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 18 × 34 = 612. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 833 + 796 = 1629. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 284 + 558 = 840. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 687 + 769 = 1456. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 270 + 262 = 533. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 30 × 76 = 2280. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 24 × 70 = 1675. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 176 + 393 = 569. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 205 + 242 = 447. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 75 × 76 = 5700. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 147 + 152 = 299. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 124 + 717 = 840. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 911 + 519 = 1426. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 73 × 62 = 4534. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 25 × 63 = 1576. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 96 × 49 = 4704. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 849 + 430 = 1281. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 234 + 242 = 472. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 591 + 265 = 856. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 24 × 22 = 534. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 423 + 158 = 575. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 994 + 129 = 1121. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 361 + 367 = 728. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 32 × 28 = 901. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 312 + 798 = 1104. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 859 + 391 = 1250. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 431 + 329 = 760. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 14 × 38 = 532. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 323 + 636 = 967. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 590 + 384 = 975. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 989 + 655 = 1644. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 620 + 299 = 919. Correct or wrong? (a) correct (b) wrong

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