Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 769 · 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: 36 × 18 = 655. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 317 + 294 = 611. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 22 × 67 = 1475. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 65 × 16 = 1039. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 61 × 49 = 2997. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 75 × 23 = 1720. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 15 × 17 = 257. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 14 × 39 = 546. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 213 + 465 = 678. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 22 × 87 = 1921. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 47 × 87 = 4089. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 550 + 977 = 1532. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 546 + 637 = 1178. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 690 + 854 = 1544. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 300 + 353 = 653. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 86 × 42 = 3612. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 57 × 52 = 2970. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 295 + 358 = 645. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 77 × 97 = 7475. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 250 + 689 = 939. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 189 + 224 = 415. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 30 × 39 = 1170. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 85 × 59 = 5012. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 99 × 77 = 7621. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 742 + 175 = 917. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 99 × 37 = 3667. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 18 × 62 = 1118. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 66 × 81 = 5340. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 626 + 843 = 1469. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 30 × 50 = 1505. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 732 + 742 = 1472. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 78 × 81 = 6318. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 776 + 331 = 1104. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 411 + 698 = 1110. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 95 × 65 = 6168. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 691 + 286 = 977. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 819 + 636 = 1455. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 88 × 70 = 6154. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 97 × 17 = 1649. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 431 + 412 = 845. Correct or wrong? (a) correct (b) wrong

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