Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 315 · 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: 903 + 543 = 1442. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 64 × 92 = 5888. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 366 + 494 = 860. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 87 × 25 = 2173. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 96 × 90 = 8643. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 77 × 51 = 3927. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 31 × 14 = 433. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 693 + 182 = 875. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 81 × 27 = 2187. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 921 + 629 = 1556. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 92 × 87 = 8012. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 195 + 170 = 370. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 892 + 348 = 1240. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 45 × 55 = 2474. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 263 + 718 = 976. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 174 + 833 = 1006. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 715 + 131 = 844. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 578 + 794 = 1372. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 90 × 59 = 5310. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 47 × 21 = 987. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 128 + 883 = 1011. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 217 + 169 = 386. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 46 × 21 = 966. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 23 × 81 = 1863. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 987 + 470 = 1450. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 93 × 76 = 7070. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 496 + 640 = 1136. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 64 × 37 = 2368. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 393 + 467 = 853. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 15 × 84 = 1259. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 28 × 60 = 1680. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 344 + 182 = 526. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 213 + 763 = 976. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 649 + 147 = 796. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 90 × 44 = 3960. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 66 × 83 = 5485. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 84 × 88 = 7392. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 435 + 818 = 1253. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 23 × 68 = 1564. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 142 + 676 = 818. Correct or wrong? (a) wrong (b) correct

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