Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 177 · 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: 94 × 58 = 5444. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 230 + 763 = 993. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 285 + 995 = 1280. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 301 + 702 = 1003. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 874 + 785 = 1659. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 917 + 847 = 1764. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 613 + 915 = 1528. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 99 × 77 = 7625. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 343 + 407 = 749. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 96 × 24 = 2299. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 920 + 459 = 1379. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 150 + 390 = 538. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 220 + 325 = 545. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 56 × 33 = 1848. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 315 + 690 = 1005. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 664 + 133 = 797. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 42 × 91 = 3814. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 759 + 288 = 1047. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 23 × 30 = 692. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 771 + 809 = 1583. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 69 × 89 = 6141. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 88 × 20 = 1754. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 153 + 836 = 987. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 758 + 999 = 1757. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 56 × 31 = 1733. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 29 × 82 = 2378. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 24 × 14 = 336. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 58 × 76 = 4412. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 711 + 976 = 1687. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 451 + 381 = 833. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 96 × 94 = 9032. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 25 × 26 = 650. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 75 × 21 = 1575. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 955 + 429 = 1388. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 92 × 47 = 4324. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 251 + 535 = 783. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 17 × 39 = 666. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 370 + 651 = 1021. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 88 × 64 = 5632. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 715 + 224 = 934. Correct or wrong? (a) correct (b) wrong

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