Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 545 · 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: 60 × 26 = 1566. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 783 + 225 = 1008. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 39 × 57 = 2215. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 537 + 440 = 977. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 481 + 738 = 1219. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 316 + 730 = 1051. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 17 × 36 = 607. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 51 × 15 = 766. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 301 + 671 = 972. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 195 + 301 = 493. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 136 + 574 = 709. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 160 + 664 = 830. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 298 + 966 = 1264. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 89 × 42 = 3741. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 791 + 191 = 990. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 346 + 411 = 757. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 80 × 33 = 2640. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 321 + 712 = 1033. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 98 × 72 = 7056. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 813 + 831 = 1644. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 25 × 41 = 1025. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 81 × 95 = 7695. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 627 + 698 = 1325. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 30 × 19 = 576. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 858 + 664 = 1517. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 62 × 47 = 2914. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 50 × 23 = 1151. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 34 × 79 = 2686. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 502 + 491 = 989. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 35 × 92 = 3222. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 875 + 321 = 1190. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 12 × 89 = 1062. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 783 + 210 = 988. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 14 × 12 = 168. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 18 × 33 = 594. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 218 + 934 = 1156. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 28 × 75 = 2100. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 92 × 91 = 8372. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 27 × 52 = 1401. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 953 + 945 = 1898. Correct or wrong? (a) wrong (b) correct

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