Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 341 · 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: 43 × 85 = 3648. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 927 + 941 = 1868. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 312 + 770 = 1082. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 14 × 44 = 613. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 48 × 70 = 3355. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 621 + 608 = 1229. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 720 + 148 = 868. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 64 × 88 = 5633. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 986 + 219 = 1203. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 669 + 661 = 1329. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 61 × 45 = 2742. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 56 × 52 = 2912. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 609 + 491 = 1092. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 259 + 732 = 984. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 711 + 224 = 935. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 39 × 51 = 1989. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 60 × 40 = 2400. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 15 × 53 = 799. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 168 + 299 = 461. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 91 × 44 = 3998. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 70 × 66 = 4614. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 764 + 978 = 1742. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 209 + 754 = 964. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 814 + 976 = 1790. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 232 + 148 = 380. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 165 + 995 = 1160. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 37 × 31 = 1147. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 875 + 479 = 1354. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 692 + 343 = 1035. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 354 + 874 = 1230. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 406 + 517 = 923. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 330 + 936 = 1266. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 29 × 14 = 400. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 82 × 22 = 1804. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 92 × 99 = 9100. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 899 + 809 = 1700. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 64 × 27 = 1725. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 145 + 429 = 574. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 96 × 95 = 9118. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 75 × 77 = 5778. Correct or wrong? (a) correct (b) wrong

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