Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 561 · 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: 33 × 47 = 1557. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 20 × 74 = 1480. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 348 + 990 = 1338. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 91 × 92 = 8372. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 649 + 211 = 852. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 38 × 61 = 2312. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 249 + 852 = 1101. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 88 × 66 = 5808. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 250 + 914 = 1166. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 55 × 50 = 2751. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 96 × 26 = 2496. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 34 × 29 = 986. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 52 × 56 = 2919. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 280 + 525 = 805. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 651 + 205 = 856. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 67 × 32 = 2144. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 82 × 16 = 1312. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 57 × 64 = 3652. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 769 + 632 = 1399. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 39 × 52 = 2033. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 52 × 25 = 1305. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 583 + 308 = 891. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 95 × 93 = 8835. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 254 + 324 = 576. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 666 + 410 = 1076. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 57 × 16 = 908. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 64 × 26 = 1664. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 56 × 37 = 2072. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 308 + 801 = 1109. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 85 × 20 = 1699. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 31 × 34 = 1052. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 695 + 273 = 968. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 64 × 49 = 3142. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 485 + 238 = 723. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 340 + 438 = 776. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 19 × 81 = 1537. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 775 + 947 = 1716. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 64 × 91 = 5824. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 923 + 418 = 1345. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 581 + 259 = 840. Correct or wrong? (a) correct (b) wrong

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