Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 46 · 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: 28 × 55 = 1535. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 32 × 46 = 1472. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 12 × 68 = 821. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 20 × 56 = 1120. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 13 × 41 = 533. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 49 × 49 = 2395. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 52 × 26 = 1345. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 750 + 372 = 1125. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 47 × 39 = 1832. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 767 + 799 = 1569. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 542 + 253 = 795. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 39 × 24 = 936. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 82 × 68 = 5576. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 268 + 840 = 1108. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 806 + 622 = 1421. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 43 × 27 = 1161. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 24 × 31 = 744. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 55 × 21 = 1159. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 807 + 136 = 944. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 69 × 17 = 1169. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 341 + 574 = 915. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 24 × 15 = 368. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 17 × 65 = 1109. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 798 + 637 = 1435. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 73 × 18 = 1317. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 486 + 449 = 935. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 42 × 42 = 1761. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 87 × 75 = 6525. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 303 + 838 = 1141. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 626 + 760 = 1388. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 70 × 13 = 910. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 69 × 84 = 5804. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 14 × 43 = 595. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 679 + 904 = 1582. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 94 × 44 = 4136. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 905 + 426 = 1331. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 26 × 91 = 2373. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 784 + 505 = 1297. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 168 + 565 = 733. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 287 + 346 = 633. Correct or wrong? (a) correct (b) wrong

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