Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 495 · 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: 26 × 87 = 2262. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 28 × 37 = 1037. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 82 × 42 = 3442. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 643 + 805 = 1450. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 41 × 73 = 2992. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 330 + 589 = 925. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 54 × 23 = 1240. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 98 × 65 = 6370. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 613 + 838 = 1451. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 265 + 780 = 1043. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 979 + 879 = 1858. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 841 + 269 = 1110. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 73 × 91 = 6646. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 762 + 344 = 1106. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 28 × 13 = 360. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 25 × 47 = 1175. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 322 + 766 = 1082. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 46 × 88 = 4043. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 29 × 98 = 2839. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 90 × 91 = 8190. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 63 × 16 = 1008. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 134 + 986 = 1120. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 86 × 69 = 5934. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 476 + 936 = 1412. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 162 + 393 = 555. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 33 × 49 = 1624. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 314 + 688 = 1002. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 606 + 152 = 763. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 222 + 763 = 985. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 437 + 480 = 917. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 937 + 715 = 1652. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 301 + 861 = 1170. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 48 × 94 = 4512. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 68 × 60 = 4080. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 353 + 657 = 1018. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 37 × 84 = 3108. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 995 + 143 = 1138. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 201 + 522 = 725. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 518 + 147 = 665. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 59 × 81 = 4772. Correct or wrong? (a) wrong (b) correct

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