Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 290 · 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: 16 × 65 = 1042. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 708 + 782 = 1494. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 236 + 185 = 421. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 641 + 921 = 1562. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 739 + 215 = 954. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 129 + 238 = 367. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 66 × 38 = 2508. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 781 + 280 = 1061. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 676 + 279 = 955. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 91 × 45 = 4093. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 544 + 622 = 1170. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 87 × 54 = 4698. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 797 + 177 = 978. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 22 × 50 = 1103. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 39 × 27 = 1053. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 970 + 848 = 1818. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 798 + 390 = 1180. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 69 × 68 = 4690. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 66 × 75 = 4943. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 408 + 535 = 943. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 738 + 550 = 1281. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 82 × 79 = 6478. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 78 × 84 = 6552. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 23 × 71 = 1633. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 14 × 77 = 1072. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 349 + 544 = 893. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 129 + 850 = 979. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 482 + 848 = 1330. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 792 + 704 = 1496. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 147 + 192 = 331. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 434 + 697 = 1131. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 286 + 129 = 415. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 685 + 565 = 1250. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 74 × 77 = 5698. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 133 + 807 = 933. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 14 × 93 = 1302. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 39 × 66 = 2580. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 47 × 40 = 1880. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 68 × 22 = 1494. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 189 + 626 = 815. Correct or wrong? (a) wrong (b) correct

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