Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 663 · 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: 44 × 65 = 2860. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 90 × 70 = 6303. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 88 × 23 = 2017. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 16 × 37 = 592. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 680 + 217 = 904. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 354 + 315 = 670. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 51 × 62 = 3162. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 329 + 676 = 1001. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 15 × 84 = 1260. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 906 + 208 = 1114. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 88 × 86 = 7563. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 758 + 424 = 1182. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 40 × 98 = 3920. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 614 + 358 = 979. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 35 × 35 = 1219. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 886 + 355 = 1241. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 16 × 97 = 1552. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 55 × 17 = 935. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 47 × 68 = 3196. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 286 + 323 = 609. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 139 + 502 = 639. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 46 × 77 = 3539. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 17 × 44 = 748. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 12 × 48 = 581. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 251 + 243 = 501. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 44 × 93 = 4092. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 63 × 23 = 1449. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 97 × 79 = 7656. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 32 × 15 = 472. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 449 + 542 = 995. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 79 × 91 = 7189. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 245 + 408 = 653. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 461 + 327 = 788. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 215 + 295 = 510. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 94 × 57 = 5365. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 375 + 712 = 1084. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 415 + 481 = 896. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 817 + 764 = 1589. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 79 × 54 = 4266. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 46 × 62 = 2852. Correct or wrong? (a) wrong (b) correct

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