Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 146 · 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: 95 × 80 = 7600. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 96 × 96 = 9216. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 722 + 859 = 1581. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 66 × 55 = 3631. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 26 × 78 = 2028. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 533 + 827 = 1360. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 178 + 213 = 397. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 995 + 300 = 1295. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 610 + 763 = 1367. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 331 + 165 = 497. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 16 × 99 = 1586. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 33 × 84 = 2767. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 122 + 819 = 941. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 84 × 78 = 6552. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 25 × 80 = 2000. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 37 × 17 = 629. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 900 + 463 = 1365. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 794 + 754 = 1548. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 86 × 56 = 4816. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 25 × 68 = 1700. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 81 × 45 = 3649. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 640 + 302 = 945. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 81 × 35 = 2833. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 63 × 40 = 2520. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 638 + 751 = 1389. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 580 + 652 = 1232. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 20 × 16 = 321. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 57 × 85 = 4841. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 140 + 882 = 1022. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 290 + 192 = 482. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 63 × 31 = 1954. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 143 + 753 = 896. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 490 + 682 = 1172. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 43 × 24 = 1039. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 313 + 556 = 865. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 912 + 515 = 1427. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 83 × 31 = 2573. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 33 × 59 = 1947. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 601 + 341 = 950. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 439 + 571 = 1011. Correct or wrong? (a) correct (b) wrong

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