Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 80 · 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: 570 + 482 = 1054. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 98 × 33 = 3234. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 728 + 882 = 1614. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 570 + 766 = 1336. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 558 + 950 = 1513. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 63 × 31 = 1945. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 249 + 269 = 524. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 42 × 21 = 881. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 273 + 502 = 775. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 56 × 67 = 3750. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 768 + 399 = 1170. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 407 + 707 = 1114. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 86 × 28 = 2408. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 62 × 21 = 1302. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 45 × 32 = 1440. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 34 × 79 = 2686. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 69 × 29 = 2009. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 89 × 31 = 2753. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 76 × 98 = 7448. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 554 + 977 = 1531. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 512 + 224 = 736. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 22 × 97 = 2134. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 815 + 894 = 1709. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 671 + 653 = 1330. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 572 + 434 = 1006. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 16 × 22 = 345. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 339 + 314 = 653. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 73 × 17 = 1244. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 277 + 377 = 661. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 50 × 71 = 3546. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 880 + 586 = 1466. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 688 + 450 = 1140. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 98 × 90 = 8828. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 148 + 872 = 1016. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 80 × 24 = 1917. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 765 + 865 = 1626. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 126 + 889 = 1023. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 215 + 188 = 403. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 123 + 907 = 1035. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 29 × 52 = 1516. Correct or wrong? (a) correct (b) wrong

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