Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 394 · 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: 332 + 220 = 551. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 241 + 601 = 842. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 435 + 327 = 757. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 202 + 573 = 783. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 82 × 43 = 3525. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 88 × 67 = 5896. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 72 × 45 = 3237. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 680 + 792 = 1472. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 260 + 478 = 733. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 388 + 420 = 808. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 39 × 46 = 1795. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 977 + 613 = 1582. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 97 × 92 = 8924. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 38 × 45 = 1713. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 820 + 726 = 1547. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 626 + 742 = 1368. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 918 + 172 = 1085. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 657 + 856 = 1513. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 33 × 70 = 2307. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 781 + 211 = 992. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 68 × 26 = 1776. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 64 × 37 = 2368. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 62 × 88 = 5450. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 36 × 83 = 2991. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 19 × 40 = 760. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 70 × 25 = 1750. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 967 + 178 = 1145. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 46 × 77 = 3542. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 347 + 437 = 784. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 710 + 800 = 1511. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 972 + 543 = 1515. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 73 × 95 = 6935. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 662 + 675 = 1337. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 23 × 38 = 880. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 703 + 283 = 986. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 823 + 408 = 1235. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 21 × 26 = 546. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 342 + 528 = 870. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 92 × 14 = 1288. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 797 + 353 = 1143. Correct or wrong? (a) correct (b) wrong

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