Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 932 · 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: 44 × 73 = 3215. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 48 × 79 = 3799. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 53 × 17 = 906. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 36 × 12 = 432. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 129 + 554 = 683. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 867 + 305 = 1172. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 143 + 528 = 672. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 912 + 995 = 1915. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 50 × 26 = 1300. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 74 × 99 = 7326. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 37 × 31 = 1147. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 91 × 28 = 2556. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 291 + 138 = 436. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 66 × 21 = 1386. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 14 × 21 = 298. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 912 + 250 = 1167. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 24 × 70 = 1684. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 473 + 241 = 714. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 46 × 44 = 2024. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 24 × 94 = 2256. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 928 + 522 = 1450. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 586 + 317 = 903. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 152 + 341 = 493. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 83 × 94 = 7808. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 83 × 80 = 6648. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 859 + 771 = 1629. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 14 × 49 = 680. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 892 + 847 = 1739. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 84 × 90 = 7560. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 60 × 60 = 3600. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 73 × 91 = 6642. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 74 × 43 = 3179. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 299 + 440 = 739. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 429 + 666 = 1095. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 50 × 69 = 3450. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 867 + 275 = 1139. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 754 + 929 = 1683. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 83 × 87 = 7218. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 141 + 828 = 964. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 798 + 253 = 1051. Correct or wrong? (a) wrong (b) correct

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