Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 273 · 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: 71 × 25 = 1775. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 336 + 209 = 545. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 723 + 723 = 1453. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 21 × 54 = 1134. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 870 + 317 = 1187. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 27 × 68 = 1836. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 78 × 19 = 1482. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 91 × 69 = 6280. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 624 + 725 = 1344. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 393 + 271 = 664. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 67 × 21 = 1407. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 163 + 359 = 522. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 44 × 82 = 3610. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 206 + 177 = 383. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 901 + 400 = 1301. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 31 × 83 = 2566. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 21 × 59 = 1239. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 50 × 59 = 2954. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 30 × 90 = 2708. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 39 × 12 = 463. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 59 × 52 = 3068. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 67 × 83 = 5561. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 976 + 321 = 1301. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 75 × 81 = 6075. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 122 + 550 = 672. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 525 + 156 = 677. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 74 × 40 = 2960. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 464 + 525 = 994. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 63 × 98 = 6174. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 198 + 780 = 978. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 24 × 13 = 312. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 67 × 99 = 6633. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 548 + 952 = 1499. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 53 × 29 = 1533. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 324 + 303 = 620. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 307 + 663 = 974. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 886 + 616 = 1502. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 15 × 73 = 1095. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 97 × 58 = 5634. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 303 + 169 = 479. Correct or wrong? (a) correct (b) wrong

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