Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 352 · 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: 730 + 761 = 1491. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 46 × 97 = 4464. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 395 + 583 = 985. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 512 + 132 = 644. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 501 + 220 = 724. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 659 + 752 = 1411. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 23 × 34 = 782. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 12 × 68 = 816. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 322 + 290 = 614. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 77 × 34 = 2626. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 73 × 68 = 4964. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 574 + 952 = 1528. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 188 + 446 = 634. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 81 × 67 = 5429. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 16 × 13 = 208. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 24 × 89 = 2136. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 74 × 62 = 4584. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 61 × 13 = 793. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 42 × 17 = 721. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 85 × 54 = 4593. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 140 + 964 = 1104. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 23 × 69 = 1592. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 179 + 326 = 510. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 940 + 708 = 1653. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 531 + 515 = 1046. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 420 + 283 = 703. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 517 + 145 = 662. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 30 × 90 = 2700. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 159 + 756 = 915. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 73 × 26 = 1898. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 900 + 384 = 1284. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 247 + 556 = 798. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 463 + 785 = 1249. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 375 + 197 = 572. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 343 + 906 = 1254. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 16 × 12 = 192. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 534 + 320 = 857. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 226 + 869 = 1088. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 831 + 469 = 1300. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 899 + 432 = 1331. Correct or wrong? (a) correct (b) wrong

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