Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 619 · 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: 66 × 89 = 5874. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 62 × 31 = 1922. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 27 × 31 = 837. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 27 × 99 = 2673. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 28 × 41 = 1155. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 24 × 69 = 1656. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 15 × 29 = 435. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 29 × 15 = 435. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 24 × 12 = 288. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 41 × 29 = 1189. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 784 + 133 = 917. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 710 + 424 = 1134. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 556 + 602 = 1158. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 54 × 19 = 1029. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 343 + 337 = 680. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 451 + 281 = 732. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 90 × 19 = 1708. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 14 × 51 = 706. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 982 + 615 = 1591. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 24 × 12 = 288. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 293 + 777 = 1070. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 444 + 998 = 1442. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 716 + 351 = 1072. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 37 × 18 = 659. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 86 × 44 = 3784. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 95 × 76 = 7217. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 413 + 424 = 840. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 628 + 181 = 815. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 596 + 965 = 1556. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 82 × 40 = 3280. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 70 × 93 = 6510. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 560 + 944 = 1503. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 292 + 536 = 824. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 792 + 375 = 1167. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 709 + 218 = 927. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 16 × 79 = 1264. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 418 + 275 = 686. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 92 × 98 = 9016. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 238 + 830 = 1071. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 84 × 19 = 1599. Correct or wrong? (a) wrong (b) correct

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