Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 226 · 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: 75 × 29 = 2175. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 50 × 65 = 3250. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 16 × 12 = 194. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 558 + 547 = 1105. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 609 + 634 = 1248. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 49 × 44 = 2156. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 246 + 131 = 376. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 41 × 58 = 2378. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 59 × 93 = 5485. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 84 × 24 = 2016. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 42 × 29 = 1218. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 120 + 726 = 846. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 440 + 613 = 1061. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 548 + 290 = 840. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 312 + 308 = 620. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 86 × 69 = 5934. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 76 × 99 = 7517. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 536 + 376 = 914. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 44 × 54 = 2376. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 476 + 978 = 1454. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 53 × 90 = 4771. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 257 + 853 = 1110. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 13 × 69 = 897. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 84 × 70 = 5880. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 556 + 255 = 811. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 93 × 40 = 3720. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 37 × 51 = 1887. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 233 + 619 = 857. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 991 + 357 = 1347. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 646 + 881 = 1530. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 97 × 94 = 9112. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 99 × 25 = 2475. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 481 + 741 = 1222. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 295 + 345 = 640. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 469 + 604 = 1073. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 500 + 367 = 860. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 71 × 82 = 5825. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 787 + 789 = 1576. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 88 × 89 = 7825. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 93 × 59 = 5481. Correct or wrong? (a) wrong (b) correct

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