Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 117 · 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: 69 × 25 = 1717. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 228 + 272 = 506. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 18 × 83 = 1497. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 19 × 22 = 418. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 56 × 32 = 1792. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 315 + 219 = 534. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 771 + 475 = 1244. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 39 × 93 = 3631. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 87 × 79 = 6875. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 32 × 88 = 2816. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 81 × 35 = 2835. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 58 × 49 = 2842. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 489 + 661 = 1151. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 25 × 48 = 1192. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 86 × 59 = 5068. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 63 × 65 = 4088. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 442 + 208 = 645. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 48 × 28 = 1340. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 16 × 82 = 1312. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 64 × 41 = 2624. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 31 × 82 = 2542. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 75 × 47 = 3532. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 405 + 446 = 852. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 30 × 93 = 2798. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 373 + 978 = 1346. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 39 × 73 = 2852. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 13 × 35 = 455. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 36 × 30 = 1080. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 28 × 75 = 2100. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 50 × 60 = 3000. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 129 + 589 = 720. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 35 × 32 = 1126. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 65 × 43 = 2795. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 81 × 82 = 6641. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 95 × 26 = 2465. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 955 + 569 = 1524. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 23 × 49 = 1127. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 166 + 845 = 1011. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 69 × 27 = 1863. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 82 × 42 = 3444. Correct or wrong? (a) correct (b) wrong

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