Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 671 · 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: 25 × 23 = 575. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 31 × 41 = 1277. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 726 + 517 = 1238. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 470 + 552 = 1022. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 881 + 723 = 1604. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 60 × 89 = 5340. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 70 × 61 = 4270. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 898 + 941 = 1833. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 786 + 787 = 1573. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 46 × 13 = 603. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 571 + 572 = 1135. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 719 + 564 = 1283. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 42 × 19 = 798. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 41 × 17 = 697. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 40 × 28 = 1120. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 54 × 44 = 2368. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 828 + 174 = 1002. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 74 × 42 = 3108. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 16 × 45 = 721. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 97 × 32 = 3104. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 23 × 79 = 1818. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 449 + 954 = 1403. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 313 + 188 = 500. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 428 + 726 = 1154. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 39 × 60 = 2340. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 230 + 592 = 822. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 77 × 36 = 2772. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 907 + 516 = 1423. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 804 + 131 = 942. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 89 × 86 = 7654. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 470 + 233 = 706. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 79 × 37 = 2923. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 936 + 284 = 1217. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 564 + 292 = 857. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 84 × 30 = 2520. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 76 × 35 = 2660. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 64 × 25 = 1600. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 59 × 16 = 941. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 79 × 42 = 3318. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 885 + 658 = 1543. Correct or wrong? (a) wrong (b) correct

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