Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 15 · 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: 423 + 869 = 1292. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 381 + 478 = 858. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 37 × 84 = 3108. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 37 × 55 = 2033. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 87 × 26 = 2262. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 589 + 424 = 1013. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 348 + 275 = 623. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 370 + 267 = 637. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 64 × 90 = 5760. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 511 + 331 = 843. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 39 × 17 = 670. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 304 + 245 = 550. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 207 + 738 = 951. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 15 × 15 = 219. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 847 + 184 = 1031. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 62 × 31 = 1917. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 481 + 653 = 1134. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 246 + 978 = 1216. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 27 × 65 = 1755. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 919 + 317 = 1237. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 91 × 46 = 4186. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 41 × 89 = 3653. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 364 + 484 = 842. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 203 + 571 = 773. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 148 + 127 = 283. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 78 × 29 = 2262. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 307 + 157 = 466. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 78 × 37 = 2881. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 388 + 225 = 613. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 640 + 407 = 1040. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 128 + 634 = 755. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 54 × 16 = 864. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 48 × 23 = 1104. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 323 + 800 = 1123. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 388 + 243 = 639. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 172 + 734 = 908. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 165 + 429 = 597. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 79 × 61 = 4821. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 83 × 46 = 3818. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 61 × 61 = 3716. Correct or wrong? (a) wrong (b) correct

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