Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 249 · 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: 36 × 38 = 1368. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 816 + 546 = 1368. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 231 + 265 = 496. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 53 × 94 = 4981. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 49 × 96 = 4704. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 99 × 27 = 2673. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 922 + 415 = 1337. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 85 × 13 = 1099. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 857 + 914 = 1771. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 99 × 52 = 5147. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 28 × 46 = 1288. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 87 × 51 = 4443. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 99 × 34 = 3366. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 87 × 63 = 5481. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 431 + 649 = 1078. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 43 × 58 = 2494. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 823 + 924 = 1747. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 39 × 33 = 1287. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 58 × 36 = 2096. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 77 × 56 = 4312. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 39 × 86 = 3349. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 56 × 72 = 4032. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 22 × 56 = 1233. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 503 + 155 = 658. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 88 × 90 = 7928. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 33 × 70 = 2310. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 74 × 59 = 4367. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 26 × 64 = 1667. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 32 × 78 = 2489. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 17 × 27 = 459. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 44 × 58 = 2552. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 817 + 616 = 1432. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 24 × 20 = 479. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 53 × 80 = 4247. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 46 × 78 = 3585. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 15 × 82 = 1233. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 92 × 80 = 7360. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 62 × 46 = 2854. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 26 × 72 = 1872. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 417 + 603 = 1020. Correct or wrong? (a) wrong (b) correct

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