Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 524 · 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: 875 + 130 = 1007. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 52 × 81 = 4212. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 56 × 87 = 4872. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 15 × 92 = 1380. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 61 × 23 = 1398. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 58 × 88 = 5106. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 87 × 80 = 6960. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 31 × 71 = 2201. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 39 × 94 = 3668. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 22 × 97 = 2135. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 188 + 336 = 524. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 553 + 238 = 799. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 36 × 58 = 2088. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 237 + 776 = 1013. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 524 + 735 = 1259. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 275 + 730 = 1007. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 60 × 23 = 1378. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 697 + 498 = 1198. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 45 × 41 = 1846. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 848 + 571 = 1422. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 33 × 78 = 2570. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 901 + 542 = 1438. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 288 + 298 = 587. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 32 × 34 = 1088. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 521 + 783 = 1304. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 449 + 293 = 745. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 61 × 26 = 1586. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 91 × 64 = 5820. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 318 + 416 = 734. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 91 × 46 = 4186. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 56 × 20 = 1120. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 142 + 490 = 632. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 730 + 933 = 1663. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 991 + 846 = 1832. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 918 + 261 = 1178. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 993 + 975 = 1966. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 82 × 94 = 7708. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 86 × 34 = 2930. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 238 + 888 = 1126. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 91 × 22 = 2002. Correct or wrong? (a) correct (b) wrong

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