Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 702 · 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: 345 + 882 = 1227. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 35 × 82 = 2878. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 34 × 91 = 3101. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 862 + 457 = 1319. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 44 × 50 = 2200. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 464 + 281 = 747. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 30 × 47 = 1410. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 26 × 19 = 492. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 29 × 75 = 2178. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 835 + 137 = 964. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 40 × 62 = 2480. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 98 × 18 = 1764. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 30 × 70 = 2100. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 288 + 320 = 608. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 28 × 58 = 1624. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 81 × 87 = 7049. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 184 + 654 = 838. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 163 + 180 = 343. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 682 + 132 = 809. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 502 + 125 = 625. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 598 + 362 = 959. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 91 × 86 = 7821. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 45 × 14 = 631. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 80 × 62 = 4960. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 63 × 22 = 1388. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 49 × 70 = 3430. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 15 × 67 = 1005. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 48 × 13 = 617. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 17 × 60 = 1020. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 679 + 676 = 1352. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 37 × 39 = 1443. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 55 × 75 = 4117. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 24 × 34 = 808. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 24 × 65 = 1560. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 66 × 23 = 1526. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 78 × 14 = 1084. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 82 × 66 = 5410. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 543 + 923 = 1466. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 19 × 79 = 1494. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 382 + 279 = 654. Correct or wrong? (a) wrong (b) correct

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