Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 534 · 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: 778 + 955 = 1733. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 75 × 51 = 3830. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 35 × 32 = 1123. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 503 + 151 = 654. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 85 × 45 = 3825. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 819 + 388 = 1211. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 345 + 339 = 681. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 559 + 893 = 1452. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 303 + 359 = 662. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 77 × 66 = 5082. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 427 + 510 = 937. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 881 + 249 = 1130. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 605 + 426 = 1031. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 75 × 18 = 1351. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 357 + 148 = 505. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 42 × 16 = 664. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 269 + 250 = 519. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 844 + 801 = 1645. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 632 + 656 = 1288. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 564 + 292 = 861. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 781 + 133 = 914. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 143 + 185 = 328. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 26 × 28 = 725. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 45 × 34 = 1524. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 799 + 625 = 1424. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 144 + 373 = 519. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 511 + 368 = 880. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 14 × 33 = 462. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 213 + 905 = 1118. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 39 × 94 = 3666. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 82 × 25 = 2046. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 94 × 42 = 3948. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 831 + 591 = 1422. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 46 × 76 = 3493. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 909 + 891 = 1798. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 75 × 26 = 1950. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 582 + 671 = 1253. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 757 + 231 = 988. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 505 + 736 = 1241. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 199 + 388 = 587. Correct or wrong? (a) wrong (b) correct

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