Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 9 · 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: 255 + 703 = 961. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 67 × 23 = 1538. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 70 × 46 = 3220. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 79 × 47 = 3713. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 48 × 84 = 4034. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 83 × 13 = 1079. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 130 + 779 = 909. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 70 × 99 = 6930. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 88 × 45 = 3960. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 482 + 931 = 1417. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 35 × 63 = 2210. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 371 + 440 = 811. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 93 × 31 = 2881. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 56 × 13 = 728. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 160 + 269 = 429. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 325 + 755 = 1072. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 29 × 32 = 930. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 794 + 201 = 995. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 23 × 13 = 303. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 945 + 912 = 1857. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 63 × 25 = 1575. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 57 × 58 = 3304. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 826 + 978 = 1798. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 20 × 71 = 1420. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 45 × 51 = 2300. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 415 + 193 = 608. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 17 × 20 = 343. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 85 × 74 = 6290. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 72 × 53 = 3817. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 79 × 14 = 1106. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 55 × 85 = 4681. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 46 × 36 = 1660. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 931 + 247 = 1185. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 64 × 35 = 2240. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 69 × 23 = 1589. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 976 + 694 = 1671. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 725 + 743 = 1468. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 812 + 366 = 1178. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 33 × 19 = 631. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 313 + 919 = 1232. Correct or wrong? (a) wrong (b) correct

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