Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 68 · 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: 131 + 597 = 728. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 16 × 17 = 272. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 398 + 188 = 586. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 77 × 75 = 5780. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 34 × 27 = 926. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 87 × 23 = 2000. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 34 × 23 = 784. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 855 + 815 = 1670. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 979 + 595 = 1574. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 50 × 37 = 1850. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 12 × 28 = 328. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 99 × 89 = 8811. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 36 × 87 = 3138. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 79 × 30 = 2370. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 81 × 18 = 1458. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 71 × 19 = 1349. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 559 + 912 = 1479. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 29 × 91 = 2647. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 53 × 35 = 1859. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 783 + 932 = 1715. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 99 × 87 = 8608. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 744 + 282 = 1026. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 820 + 456 = 1281. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 56 × 51 = 2856. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 43 × 54 = 2322. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 20 × 19 = 380. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 36 × 26 = 936. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 544 + 367 = 914. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 849 + 803 = 1652. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 62 × 75 = 4650. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 387 + 739 = 1126. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 129 + 124 = 253. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 922 + 723 = 1645. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 961 + 510 = 1471. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 48 × 60 = 2879. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 61 × 88 = 5368. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 69 × 18 = 1238. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 59 × 68 = 4011. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 950 + 894 = 1840. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 37 × 80 = 2960. Correct or wrong? (a) correct (b) wrong

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