Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 346 · 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: 500 + 933 = 1433. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 79 × 90 = 7110. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 30 × 70 = 2099. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 613 + 285 = 898. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 68 × 38 = 2584. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 240 + 595 = 839. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 79 × 13 = 1032. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 768 + 523 = 1289. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 47 × 42 = 1974. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 30 × 56 = 1680. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 41 × 81 = 3328. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 311 + 983 = 1294. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 53 × 37 = 1954. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 61 × 30 = 1830. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 98 × 44 = 4304. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 27 × 94 = 2535. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 948 + 717 = 1665. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 626 + 518 = 1144. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 82 × 75 = 6142. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 708 + 223 = 939. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 44 × 13 = 568. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 529 + 379 = 905. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 481 + 477 = 962. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 983 + 289 = 1272. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 72 × 35 = 2520. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 13 × 45 = 578. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 17 × 64 = 1088. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 64 × 27 = 1730. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 42 × 20 = 840. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 32 × 50 = 1600. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 431 + 210 = 649. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 96 × 41 = 3936. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 157 + 558 = 719. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 219 + 774 = 991. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 692 + 283 = 975. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 93 × 61 = 5666. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 42 × 69 = 2898. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 98 × 69 = 6762. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 280 + 698 = 978. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 43 × 16 = 693. Correct or wrong? (a) correct (b) wrong

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