Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 916 · 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: 91 × 99 = 9009. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 59 × 22 = 1295. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 53 × 33 = 1749. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 47 × 58 = 2719. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 803 + 390 = 1199. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 386 + 701 = 1095. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 27 × 57 = 1539. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 68 × 54 = 3668. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 12 × 28 = 336. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 51 × 57 = 2907. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 16 × 90 = 1440. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 927 + 225 = 1152. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 75 × 38 = 2857. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 21 × 54 = 1134. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 366 + 425 = 791. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 778 + 120 = 890. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 861 + 317 = 1178. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 73 × 57 = 4161. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 23 × 60 = 1380. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 34 × 47 = 1600. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 15 × 67 = 1003. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 957 + 123 = 1088. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 84 × 83 = 6977. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 650 + 922 = 1572. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 31 × 44 = 1364. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 437 + 218 = 657. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 466 + 980 = 1446. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 313 + 718 = 1031. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 17 × 20 = 339. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 276 + 516 = 788. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 17 × 69 = 1173. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 95 × 67 = 6373. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 47 × 57 = 2679. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 986 + 429 = 1415. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 29 × 57 = 1651. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 392 + 276 = 668. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 20 × 20 = 404. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 875 + 479 = 1358. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 420 + 685 = 1105. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 940 + 302 = 1237. Correct or wrong? (a) wrong (b) correct

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