Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 758 · 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: 294 + 830 = 1124. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 597 + 250 = 849. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 52 × 53 = 2759. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 347 + 140 = 486. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 55 × 90 = 4958. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 28 × 63 = 1767. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 39 × 23 = 902. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 900 + 683 = 1583. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 130 + 602 = 725. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 13 × 77 = 1000. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 27 × 77 = 2085. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 695 + 575 = 1270. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 578 + 215 = 793. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 77 × 72 = 5542. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 489 + 338 = 833. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 19 × 75 = 1425. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 776 + 769 = 1545. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 13 × 86 = 1121. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 25 × 21 = 525. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 91 × 15 = 1365. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 99 × 97 = 9603. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 84 × 44 = 3696. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 984 + 258 = 1242. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 27 × 19 = 513. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 263 + 284 = 540. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 945 + 130 = 1072. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 16 × 55 = 879. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 367 + 616 = 979. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 195 + 225 = 424. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 78 × 43 = 3352. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 15 × 26 = 387. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 239 + 167 = 403. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 22 × 42 = 928. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 87 × 38 = 3307. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 67 × 50 = 3353. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 44 × 19 = 836. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 983 + 874 = 1857. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 682 + 865 = 1552. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 26 × 81 = 2104. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 27 × 70 = 1890. Correct or wrong? (a) correct (b) wrong

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