Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 636 · 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: 67 × 58 = 3886. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 54 × 72 = 3888. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 256 + 455 = 711. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 68 × 32 = 2176. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 250 + 768 = 1018. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 157 + 937 = 1094. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 34 × 50 = 1700. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 347 + 694 = 1041. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 343 + 787 = 1133. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 63 × 46 = 2898. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 187 + 122 = 309. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 65 × 82 = 5336. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 321 + 198 = 519. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 935 + 552 = 1487. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 26 × 89 = 2311. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 70 × 32 = 2240. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 93 × 20 = 1860. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 586 + 887 = 1473. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 407 + 380 = 786. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 92 × 67 = 6159. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 383 + 140 = 517. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 460 + 184 = 641. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 746 + 566 = 1312. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 650 + 630 = 1275. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 21 × 34 = 714. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 43 × 51 = 2186. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 53 × 62 = 3286. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 564 + 549 = 1113. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 25 × 92 = 2292. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 810 + 902 = 1712. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 247 + 268 = 520. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 137 + 846 = 983. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 780 + 924 = 1703. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 87 × 44 = 3835. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 71 × 29 = 2059. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 58 × 37 = 2146. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 494 + 674 = 1161. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 622 + 679 = 1301. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 164 + 983 = 1147. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 280 + 446 = 723. Correct or wrong? (a) wrong (b) correct

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