Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 228 · 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: 309 + 306 = 615. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 576 + 369 = 951. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 63 × 92 = 5796. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 99 × 40 = 3968. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 13 × 26 = 342. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 18 × 53 = 954. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 19 × 97 = 1848. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 723 + 963 = 1686. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 68 × 35 = 2380. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 57 × 52 = 2964. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 97 × 67 = 6499. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 74 × 23 = 1704. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 66 × 82 = 5412. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 80 × 57 = 4560. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 133 + 215 = 348. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 65 × 57 = 3705. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 54 × 81 = 4366. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 50 × 85 = 4251. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 58 × 43 = 2499. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 898 + 152 = 1043. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 29 × 30 = 865. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 75 × 14 = 1050. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 66 × 12 = 792. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 716 + 279 = 995. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 762 + 972 = 1734. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 744 + 165 = 904. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 446 + 688 = 1132. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 746 + 337 = 1084. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 71 × 23 = 1630. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 38 × 61 = 2311. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 30 × 82 = 2460. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 23 × 38 = 880. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 466 + 337 = 804. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 23 × 36 = 828. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 467 + 425 = 892. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 61 × 91 = 5551. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 53 × 92 = 4876. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 32 × 58 = 1864. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 66 × 80 = 5278. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 24 × 67 = 1603. Correct or wrong? (a) wrong (b) correct

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