Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 379 · 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: 82 × 30 = 2454. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 54 × 35 = 1893. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 27 × 27 = 727. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 701 + 739 = 1433. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 563 + 744 = 1307. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 81 × 56 = 4528. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 556 + 141 = 698. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 60 × 67 = 4013. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 278 + 653 = 931. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 22 × 34 = 741. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 416 + 857 = 1273. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 889 + 262 = 1158. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 48 × 64 = 3065. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 63 × 53 = 3339. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 69 × 17 = 1173. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 18 × 77 = 1394. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 42 × 93 = 3903. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 335 + 208 = 542. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 253 + 449 = 702. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 14 × 13 = 184. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 857 + 942 = 1804. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 67 × 80 = 5360. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 91 × 85 = 7735. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 55 × 28 = 1532. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 73 × 91 = 6650. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 953 + 922 = 1875. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 234 + 748 = 979. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 668 + 272 = 943. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 97 × 74 = 7178. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 16 × 71 = 1136. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 208 + 761 = 969. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 69 × 62 = 4278. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 42 × 95 = 3990. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 667 + 472 = 1141. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 962 + 501 = 1463. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 420 + 808 = 1228. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 297 + 665 = 962. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 191 + 582 = 773. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 92 × 97 = 8925. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 63 × 23 = 1455. Correct or wrong? (a) wrong (b) correct

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