Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 809 · 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: 283 + 740 = 1023. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 49 × 49 = 2398. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 781 + 265 = 1046. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 51 × 85 = 4335. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 72 × 35 = 2516. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 844 + 950 = 1794. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 31 × 30 = 937. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 706 + 434 = 1136. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 654 + 121 = 775. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 333 + 541 = 874. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 700 + 264 = 964. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 461 + 186 = 651. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 813 + 598 = 1407. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 905 + 554 = 1464. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 126 + 486 = 618. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 729 + 967 = 1699. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 58 × 99 = 5742. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 85 × 51 = 4330. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 15 × 83 = 1253. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 275 + 201 = 476. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 48 × 72 = 3456. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 825 + 153 = 974. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 48 × 49 = 2355. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 510 + 141 = 647. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 76 × 42 = 3185. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 675 + 262 = 937. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 756 + 382 = 1138. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 172 + 956 = 1128. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 932 + 917 = 1849. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 912 + 397 = 1309. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 739 + 413 = 1158. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 340 + 624 = 964. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 194 + 784 = 986. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 736 + 345 = 1081. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 86 × 66 = 5678. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 342 + 810 = 1152. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 26 × 72 = 1872. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 782 + 444 = 1218. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 80 × 24 = 1920. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 345 + 529 = 874. Correct or wrong? (a) wrong (b) correct

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