Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 239 · 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: 23 × 25 = 575. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 16 × 63 = 1008. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 93 × 27 = 2510. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 699 + 873 = 1573. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 45 × 84 = 3780. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 563 + 834 = 1405. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 12 × 48 = 576. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 54 × 46 = 2488. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 66 × 26 = 1716. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 729 + 854 = 1583. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 683 + 445 = 1135. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 99 × 96 = 9498. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 889 + 207 = 1099. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 94 × 36 = 3391. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 915 + 643 = 1558. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 58 × 22 = 1283. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 41 × 71 = 2911. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 825 + 388 = 1213. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 51 × 30 = 1535. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 31 × 93 = 2883. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 37 × 21 = 783. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 788 + 740 = 1528. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 47 × 94 = 4418. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 377 + 407 = 784. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 370 + 394 = 764. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 53 × 64 = 3392. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 25 × 84 = 2100. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 67 × 47 = 3149. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 69 × 26 = 1794. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 364 + 165 = 529. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 868 + 322 = 1190. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 27 × 50 = 1350. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 89 × 26 = 2318. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 280 + 167 = 447. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 66 × 84 = 5544. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 51 × 53 = 2703. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 38 × 96 = 3649. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 331 + 891 = 1222. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 408 + 226 = 634. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 899 + 848 = 1743. Correct or wrong? (a) correct (b) wrong

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