Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 409 · 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: 363 + 429 = 792. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 979 + 679 = 1657. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 170 + 794 = 962. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 17 × 79 = 1342. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 987 + 140 = 1130. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 526 + 871 = 1404. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 37 × 50 = 1854. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 405 + 183 = 588. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 143 + 869 = 1006. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 34 × 61 = 2076. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 385 + 951 = 1332. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 97 × 78 = 7566. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 330 + 162 = 492. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 40 × 57 = 2280. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 76 × 53 = 4028. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 26 × 29 = 754. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 928 + 869 = 1797. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 372 + 643 = 1015. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 536 + 313 = 846. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 29 × 40 = 1160. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 26 × 97 = 2522. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 52 × 39 = 2028. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 251 + 247 = 498. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 571 + 395 = 966. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 16 × 74 = 1184. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 80 × 83 = 6640. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 52 × 98 = 5096. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 79 × 86 = 6787. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 42 × 87 = 3654. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 80 × 40 = 3200. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 29 × 69 = 1999. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 358 + 793 = 1145. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 88 × 58 = 5104. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 734 + 587 = 1322. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 251 + 820 = 1067. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 96 × 56 = 5376. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 73 × 89 = 6497. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 75 × 75 = 5627. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 75 × 86 = 6450. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 917 + 164 = 1081. Correct or wrong? (a) correct (b) wrong

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