Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 218 · 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: 29 × 64 = 1856. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 277 + 426 = 706. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 72 × 44 = 3168. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 79 × 54 = 4265. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 863 + 283 = 1146. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 28 × 96 = 2692. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 56 × 62 = 3465. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 245 + 145 = 386. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 464 + 564 = 1028. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 42 × 26 = 1087. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 292 + 691 = 983. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 37 × 66 = 2444. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 70 × 85 = 5950. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 23 × 43 = 989. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 36 × 15 = 539. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 32 × 80 = 2561. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 91 × 84 = 7644. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 72 × 61 = 4392. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 215 + 594 = 816. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 26 × 53 = 1378. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 591 + 639 = 1230. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 964 + 362 = 1326. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 87 × 15 = 1305. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 767 + 621 = 1388. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 64 × 79 = 5056. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 144 + 359 = 503. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 408 + 123 = 530. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 96 × 35 = 3360. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 505 + 472 = 977. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 15 × 22 = 325. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 55 × 65 = 3577. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 210 + 301 = 518. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 96 × 62 = 5952. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 34 × 21 = 706. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 997 + 338 = 1338. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 522 + 473 = 995. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 55 × 90 = 4950. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 88 × 63 = 5544. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 639 + 298 = 937. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 908 + 602 = 1502. Correct or wrong? (a) correct (b) wrong

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