Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 138 · 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: 24 × 72 = 1728. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 86 × 44 = 3787. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 35 × 65 = 2273. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 73 × 44 = 3212. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 86 × 54 = 4645. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 378 + 442 = 820. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 55 × 22 = 1210. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 40 × 30 = 1200. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 261 + 337 = 598. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 13 × 32 = 423. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 191 + 344 = 535. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 28 × 38 = 1064. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 73 × 40 = 2914. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 96 × 50 = 4800. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 23 × 20 = 468. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 593 + 979 = 1570. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 985 + 491 = 1476. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 760 + 903 = 1665. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 325 + 341 = 670. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 98 × 85 = 8329. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 617 + 583 = 1204. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 54 × 67 = 3616. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 889 + 614 = 1503. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 89 × 49 = 4361. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 600 + 776 = 1381. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 18 × 19 = 345. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 46 × 47 = 2162. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 532 + 640 = 1172. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 18 × 15 = 270. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 445 + 431 = 876. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 40 × 46 = 1840. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 74 × 98 = 7252. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 740 + 900 = 1640. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 77 × 16 = 1232. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 437 + 293 = 730. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 34 × 12 = 413. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 242 + 352 = 594. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 743 + 789 = 1532. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 99 × 61 = 6039. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 22 × 61 = 1349. Correct or wrong? (a) correct (b) wrong

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