Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 196 · 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: 76 × 59 = 4489. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 767 + 129 = 904. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 501 + 919 = 1420. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 427 + 251 = 678. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 87 × 92 = 8006. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 68 × 67 = 4549. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 73 × 28 = 2046. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 87 × 64 = 5565. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 898 + 646 = 1544. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 12 × 41 = 492. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 92 × 86 = 7918. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 73 × 83 = 6059. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 776 + 272 = 1048. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 87 × 39 = 3390. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 37 × 12 = 444. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 96 × 77 = 7397. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 611 + 272 = 883. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 226 + 514 = 733. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 33 × 70 = 2310. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 40 × 49 = 1961. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 70 × 59 = 4130. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 208 + 229 = 435. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 181 + 160 = 341. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 283 + 201 = 484. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 92 × 27 = 2490. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 41 × 52 = 2132. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 899 + 199 = 1105. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 415 + 334 = 749. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 573 + 282 = 855. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 40 × 85 = 3400. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 50 × 88 = 4403. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 70 × 63 = 4410. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 21 × 17 = 357. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 41 × 20 = 812. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 54 × 37 = 2003. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 143 + 709 = 852. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 51 × 59 = 3009. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 286 + 801 = 1087. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 138 + 210 = 345. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 557 + 266 = 817. Correct or wrong? (a) correct (b) wrong

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