Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 610 · 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: 79 × 28 = 2209. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 87 × 27 = 2342. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 604 + 195 = 801. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 67 × 35 = 2345. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 30 × 43 = 1297. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 516 + 472 = 990. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 805 + 318 = 1123. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 166 + 258 = 424. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 85 × 51 = 4335. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 346 + 817 = 1166. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 55 × 98 = 5390. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 92 × 77 = 7084. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 454 + 428 = 882. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 525 + 326 = 848. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 232 + 238 = 462. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 426 + 589 = 1018. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 57 × 66 = 3762. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 358 + 830 = 1185. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 612 + 270 = 882. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 76 × 56 = 4256. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 17 × 56 = 952. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 658 + 486 = 1150. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 142 + 461 = 603. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 74 × 85 = 6290. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 59 × 95 = 5606. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 520 + 586 = 1109. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 42 × 28 = 1176. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 60 × 83 = 4980. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 839 + 203 = 1045. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 242 + 845 = 1093. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 15 × 36 = 536. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 52 × 17 = 884. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 365 + 470 = 834. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 37 × 41 = 1514. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 57 × 25 = 1426. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 172 + 452 = 624. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 140 + 752 = 894. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 151 + 588 = 739. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 29 × 47 = 1361. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 255 + 916 = 1163. Correct or wrong? (a) wrong (b) correct

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