Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 369 · 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: 85 × 94 = 7990. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 540 + 863 = 1403. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 404 + 673 = 1077. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 19 × 57 = 1083. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 603 + 916 = 1519. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 12 × 47 = 564. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 557 + 870 = 1427. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 69 × 76 = 5243. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 32 × 60 = 1926. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 762 + 735 = 1497. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 20 × 19 = 375. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 91 × 65 = 5907. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 14 × 73 = 1022. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 256 + 938 = 1194. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 55 × 20 = 1092. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 92 × 30 = 2760. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 622 + 604 = 1226. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 383 + 481 = 864. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 50 × 20 = 1007. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 77 × 31 = 2386. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 46 × 35 = 1610. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 30 × 80 = 2397. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 130 + 988 = 1118. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 21 × 71 = 1492. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 741 + 770 = 1514. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 18 × 24 = 432. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 744 + 294 = 1038. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 330 + 452 = 782. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 56 × 66 = 3692. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 367 + 823 = 1190. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 26 × 50 = 1300. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 214 + 877 = 1091. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 70 × 42 = 2941. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 806 + 386 = 1192. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 278 + 675 = 953. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 22 × 95 = 2090. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 33 × 61 = 2013. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 168 + 425 = 593. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 91 × 98 = 8915. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 63 × 33 = 2081. Correct or wrong? (a) wrong (b) correct

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