Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 27 · 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: 63 × 86 = 5422. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 754 + 951 = 1711. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 69 × 83 = 5727. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 34 × 52 = 1768. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 19 × 16 = 304. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 76 × 70 = 5320. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 85 × 52 = 4425. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 93 × 48 = 4464. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 23 × 83 = 1902. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 969 + 609 = 1579. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 18 × 56 = 1005. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 586 + 832 = 1421. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 864 + 669 = 1533. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 62 × 54 = 3348. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 636 + 513 = 1149. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 208 + 495 = 708. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 31 × 64 = 1984. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 993 + 287 = 1273. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 37 × 98 = 3627. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 80 × 74 = 5920. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 61 × 12 = 732. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 50 × 74 = 3692. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 172 + 322 = 495. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 74 × 14 = 1036. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 72 × 54 = 3892. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 58 × 79 = 4582. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 68 × 14 = 945. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 18 × 24 = 438. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 960 + 752 = 1709. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 895 + 690 = 1581. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 16 × 98 = 1568. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 752 + 144 = 899. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 70 × 27 = 1890. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 64 × 95 = 6080. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 34 × 59 = 2001. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 610 + 278 = 888. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 30 × 85 = 2550. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 629 + 405 = 1034. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 92 × 45 = 4139. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 675 + 699 = 1366. Correct or wrong? (a) correct (b) wrong

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