Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 653 · 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: 511 + 577 = 1088. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 85 × 36 = 3060. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 476 + 486 = 962. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 16 × 43 = 688. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 97 × 19 = 1843. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 392 + 488 = 886. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 29 × 75 = 2175. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 92 × 77 = 7084. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 818 + 668 = 1487. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 619 + 918 = 1529. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 22 × 18 = 399. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 14 × 66 = 924. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 66 × 67 = 4422. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 931 + 511 = 1438. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 598 + 957 = 1555. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 60 × 33 = 1980. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 95 × 33 = 3135. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 518 + 276 = 792. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 67 × 92 = 6156. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 53 × 74 = 3927. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 505 + 141 = 652. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 76 × 96 = 7298. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 866 + 732 = 1598. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 692 + 240 = 933. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 55 × 59 = 3249. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 522 + 534 = 1056. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 84 × 57 = 4785. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 63 × 50 = 3150. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 55 × 69 = 3795. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 521 + 501 = 1022. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 37 × 42 = 1561. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 259 + 850 = 1102. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 13 × 82 = 1066. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 641 + 867 = 1508. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 16 × 28 = 448. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 50 × 83 = 4150. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 51 × 69 = 3526. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 863 + 773 = 1636. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 57 × 64 = 3642. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 566 + 633 = 1199. Correct or wrong? (a) correct (b) wrong

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