Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 834 · 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: 669 + 854 = 1523. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 445 + 903 = 1351. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 543 + 351 = 894. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 731 + 250 = 986. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 614 + 336 = 950. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 729 + 525 = 1251. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 88 × 51 = 4488. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 79 × 15 = 1187. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 851 + 735 = 1586. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 68 × 83 = 5638. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 59 × 75 = 4424. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 89 × 26 = 2314. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 91 × 61 = 5549. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 25 × 13 = 325. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 27 × 70 = 1894. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 48 × 38 = 1827. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 37 × 60 = 2220. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 308 + 810 = 1114. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 802 + 221 = 1023. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 71 × 90 = 6387. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 69 × 31 = 2131. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 46 × 60 = 2760. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 155 + 484 = 642. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 37 × 96 = 3552. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 42 × 39 = 1638. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 987 + 517 = 1496. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 66 × 63 = 4158. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 24 × 34 = 824. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 39 × 80 = 3120. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 44 × 71 = 3124. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 449 + 355 = 802. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 61 × 96 = 5856. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 32 × 64 = 2052. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 504 + 706 = 1210. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 65 × 89 = 5793. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 43 × 73 = 3138. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 37 × 89 = 3293. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 516 + 178 = 694. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 406 + 954 = 1360. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 174 + 995 = 1176. Correct or wrong? (a) wrong (b) correct

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