Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 587 · 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: 85 × 21 = 1785. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 235 + 999 = 1234. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 889 + 506 = 1395. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 861 + 740 = 1601. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 74 × 97 = 7170. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 74 × 29 = 2139. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 15 × 71 = 1065. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 248 + 221 = 469. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 66 × 17 = 1125. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 41 × 93 = 3819. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 776 + 716 = 1492. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 713 + 451 = 1165. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 848 + 178 = 1026. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 583 + 217 = 800. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 86 × 84 = 7229. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 937 + 508 = 1446. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 71 × 44 = 3124. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 14 × 88 = 1238. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 13 × 19 = 247. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 21 × 79 = 1657. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 28 × 96 = 2694. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 723 + 205 = 934. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 197 + 789 = 986. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 487 + 661 = 1148. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 714 + 756 = 1470. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 44 × 70 = 3075. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 56 × 56 = 3136. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 52 × 40 = 2076. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 43 × 46 = 1978. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 88 × 72 = 6342. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 916 + 924 = 1840. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 958 + 634 = 1592. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 98 × 73 = 7154. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 97 × 78 = 7558. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 63 × 32 = 2014. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 82 × 80 = 6553. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 502 + 550 = 1059. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 163 + 390 = 558. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 81 × 17 = 1375. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 64 × 48 = 3064. Correct or wrong? (a) wrong (b) correct

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