Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 119 · 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: 575 + 554 = 1129. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 25 × 17 = 420. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 99 × 79 = 7821. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 951 + 581 = 1532. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 438 + 296 = 734. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 85 × 15 = 1278. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 91 × 69 = 6273. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 285 + 651 = 936. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 408 + 297 = 705. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 98 × 50 = 4900. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 599 + 524 = 1128. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 148 + 539 = 695. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 595 + 925 = 1520. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 95 × 17 = 1615. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 49 × 59 = 2891. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 542 + 323 = 873. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 14 × 37 = 518. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 561 + 429 = 990. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 742 + 304 = 1046. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 970 + 150 = 1120. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 26 × 23 = 598. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 241 + 948 = 1189. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 214 + 897 = 1111. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 23 × 63 = 1449. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 682 + 696 = 1386. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 566 + 582 = 1148. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 326 + 615 = 943. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 45 × 33 = 1487. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 333 + 792 = 1125. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 523 + 303 = 830. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 16 × 60 = 960. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 77 × 75 = 5775. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 774 + 779 = 1553. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 50 × 71 = 3550. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 702 + 453 = 1152. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 566 + 879 = 1445. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 82 × 53 = 4346. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 54 × 34 = 1837. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 61 × 43 = 2623. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 504 + 845 = 1342. Correct or wrong? (a) correct (b) wrong

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