Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 184 · 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: 61 × 53 = 3233. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 99 × 79 = 7817. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 45 × 44 = 1972. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 79 × 62 = 4898. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 162 + 511 = 673. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 502 + 634 = 1136. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 404 + 646 = 1047. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 93 × 21 = 1953. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 31 × 56 = 1736. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 33 × 51 = 1688. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 44 × 14 = 616. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 631 + 299 = 926. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 793 + 218 = 1011. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 21 × 87 = 1827. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 670 + 585 = 1255. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 16 × 58 = 933. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 68 × 20 = 1361. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 35 × 34 = 1190. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 58 × 30 = 1740. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 86 × 66 = 5676. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 393 + 623 = 1016. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 26 × 97 = 2526. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 36 × 16 = 573. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 37 × 32 = 1184. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 307 + 591 = 894. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 834 + 556 = 1390. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 651 + 316 = 968. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 36 × 53 = 1913. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 143 + 136 = 279. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 26 × 43 = 1118. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 86 × 98 = 8430. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 67 × 24 = 1608. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 41 × 18 = 746. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 68 × 94 = 6392. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 132 + 421 = 560. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 486 + 233 = 713. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 826 + 163 = 989. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 996 + 731 = 1727. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 198 + 313 = 517. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 928 + 384 = 1312. Correct or wrong? (a) wrong (b) correct

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