Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 501 · 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: 47 × 48 = 2256. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 78 × 83 = 6469. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 44 × 39 = 1711. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 86 × 52 = 4472. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 332 + 436 = 768. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 898 + 777 = 1676. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 577 + 885 = 1469. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 55 × 82 = 4505. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 15 × 16 = 240. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 451 + 373 = 830. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 607 + 390 = 997. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 37 × 65 = 2400. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 84 × 84 = 7056. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 663 + 563 = 1225. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 373 + 189 = 559. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 568 + 389 = 957. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 338 + 659 = 994. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 40 × 72 = 2883. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 748 + 770 = 1518. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 714 + 412 = 1126. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 16 × 91 = 1456. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 611 + 558 = 1169. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 24 × 61 = 1464. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 444 + 411 = 855. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 83 × 45 = 3729. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 318 + 892 = 1210. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 262 + 246 = 508. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 88 × 29 = 2546. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 78 × 77 = 6006. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 99 × 74 = 7326. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 66 × 47 = 3102. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 406 + 672 = 1078. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 57 × 54 = 3078. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 21 × 43 = 908. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 42 × 14 = 588. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 663 + 693 = 1356. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 18 × 95 = 1710. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 858 + 356 = 1215. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 52 × 15 = 772. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 978 + 744 = 1724. Correct or wrong? (a) correct (b) wrong

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