Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 614 · 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: 823 + 738 = 1566. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 16 × 54 = 858. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 96 × 42 = 4033. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 24 × 89 = 2136. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 24 × 93 = 2232. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 235 + 182 = 420. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 899 + 376 = 1275. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 92 × 45 = 4148. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 42 × 56 = 2352. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 378 + 828 = 1208. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 71 × 53 = 3763. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 996 + 632 = 1628. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 890 + 825 = 1715. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 49 × 64 = 3134. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 443 + 462 = 905. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 12 × 94 = 1134. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 121 + 132 = 255. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 515 + 127 = 642. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 546 + 741 = 1287. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 305 + 644 = 942. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 34 × 39 = 1326. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 62 × 41 = 2541. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 48 × 91 = 4368. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 17 × 18 = 306. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 727 + 233 = 966. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 970 + 946 = 1922. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 76 × 24 = 1824. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 139 + 222 = 361. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 281 + 813 = 1094. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 859 + 554 = 1411. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 22 × 17 = 374. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 631 + 412 = 1051. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 369 + 338 = 703. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 36 × 72 = 2592. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 19 × 65 = 1229. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 92 × 30 = 2760. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 566 + 436 = 1002. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 19 × 84 = 1603. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 392 + 257 = 650. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 21 × 75 = 1583. Correct or wrong? (a) wrong (b) correct

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