Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 657 · 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: 89 × 81 = 7206. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 411 + 935 = 1354. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 952 + 192 = 1152. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 960 + 515 = 1475. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 46 × 60 = 2760. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 60 × 30 = 1805. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 230 + 127 = 357. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 638 + 468 = 1114. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 551 + 972 = 1518. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 59 × 18 = 1062. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 32 × 16 = 512. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 58 × 91 = 5278. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 854 + 221 = 1075. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 66 × 88 = 5808. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 286 + 320 = 605. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 88 × 67 = 5893. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 16 × 26 = 416. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 13 × 73 = 950. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 76 × 59 = 4489. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 176 + 800 = 974. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 442 + 852 = 1292. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 57 × 41 = 2337. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 46 × 76 = 3495. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 32 × 75 = 2400. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 35 × 77 = 2695. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 256 + 234 = 490. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 69 × 67 = 4625. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 841 + 942 = 1783. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 33 × 98 = 3237. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 376 + 376 = 755. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 348 + 836 = 1184. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 77 × 37 = 2853. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 86 × 58 = 4988. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 533 + 707 = 1240. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 85 × 79 = 6712. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 779 + 226 = 1005. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 518 + 982 = 1500. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 92 × 79 = 7268. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 836 + 998 = 1834. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 81 × 18 = 1458. Correct or wrong? (a) wrong (b) correct

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