Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 725 · 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: 607 + 254 = 868. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 64 × 24 = 1541. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 325 + 208 = 526. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 506 + 967 = 1473. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 752 + 898 = 1655. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 513 + 160 = 673. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 89 × 43 = 3827. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 252 + 651 = 908. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 411 + 385 = 796. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 784 + 884 = 1668. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 36 × 32 = 1152. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 502 + 949 = 1451. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 52 × 18 = 936. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 65 × 22 = 1430. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 52 × 64 = 3328. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 81 × 51 = 4123. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 12 × 39 = 468. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 21 × 58 = 1224. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 78 × 73 = 5694. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 317 + 347 = 664. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 46 × 40 = 1840. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 95 × 89 = 8461. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 205 + 754 = 956. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 42 × 21 = 882. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 54 × 65 = 3506. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 28 × 61 = 1711. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 289 + 617 = 906. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 942 + 342 = 1284. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 768 + 217 = 986. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 17 × 43 = 728. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 193 + 240 = 433. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 353 + 486 = 840. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 372 + 613 = 985. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 72 × 82 = 5904. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 285 + 357 = 642. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 439 + 764 = 1200. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 547 + 771 = 1318. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 692 + 608 = 1300. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 367 + 804 = 1171. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 759 + 913 = 1674. Correct or wrong? (a) wrong (b) correct

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