Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 102 · 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: 393 + 752 = 1151. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 255 + 733 = 987. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 18 × 94 = 1699. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 616 + 134 = 744. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 988 + 317 = 1305. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 32 × 56 = 1800. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 38 × 44 = 1673. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 59 × 73 = 4313. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 299 + 413 = 716. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 58 × 36 = 2088. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 760 + 776 = 1536. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 207 + 329 = 536. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 604 + 862 = 1463. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 80 × 86 = 6876. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 349 + 590 = 942. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 52 × 27 = 1403. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 64 × 62 = 3968. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 923 + 121 = 1045. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 415 + 492 = 907. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 897 + 919 = 1816. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 739 + 199 = 938. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 503 + 580 = 1083. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 275 + 669 = 943. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 49 × 77 = 3773. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 61 × 28 = 1708. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 19 × 38 = 722. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 17 × 61 = 1037. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 71 × 47 = 3343. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 123 + 269 = 392. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 88 × 91 = 8008. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 768 + 904 = 1672. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 247 + 885 = 1126. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 22 × 91 = 2000. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 587 + 934 = 1521. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 63 × 45 = 2835. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 229 + 276 = 505. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 93 × 57 = 5301. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 36 × 76 = 2743. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 63 × 92 = 5796. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 318 + 162 = 481. Correct or wrong? (a) wrong (b) correct

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