Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 659 · 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: 22 × 51 = 1122. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 15 × 65 = 975. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 13 × 23 = 300. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 56 × 55 = 3082. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 195 + 436 = 633. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 358 + 177 = 535. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 731 + 163 = 902. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 88 × 26 = 2294. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 28 × 30 = 840. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 68 × 28 = 1899. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 960 + 468 = 1428. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 33 × 16 = 533. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 47 × 74 = 3478. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 174 + 514 = 696. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 77 × 38 = 2926. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 749 + 859 = 1603. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 33 × 89 = 2934. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 21 × 17 = 357. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 395 + 763 = 1158. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 98 × 44 = 4313. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 15 × 35 = 533. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 83 × 20 = 1661. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 21 × 56 = 1176. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 841 + 811 = 1652. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 629 + 223 = 856. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 99 × 62 = 6145. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 963 + 821 = 1779. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 880 + 511 = 1391. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 327 + 262 = 588. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 69 × 62 = 4278. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 27 × 24 = 648. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 21 × 31 = 651. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 84 × 89 = 7476. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 17 × 53 = 901. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 464 + 652 = 1116. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 52 × 93 = 4835. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 642 + 868 = 1512. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 12 × 61 = 732. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 361 + 522 = 883. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 961 + 336 = 1303. Correct or wrong? (a) wrong (b) correct

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