Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 274 · 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: 93 × 66 = 6136. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 75 × 25 = 1875. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 491 + 879 = 1370. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 34 × 67 = 2278. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 649 + 793 = 1434. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 725 + 404 = 1127. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 965 + 439 = 1404. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 529 + 987 = 1516. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 17 × 90 = 1527. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 545 + 444 = 989. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 720 + 732 = 1452. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 970 + 770 = 1741. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 274 + 271 = 540. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 466 + 652 = 1118. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 17 × 35 = 593. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 24 × 22 = 528. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 606 + 315 = 922. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 97 × 54 = 5239. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 775 + 713 = 1487. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 99 × 32 = 3168. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 143 + 919 = 1065. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 767 + 814 = 1577. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 93 × 65 = 6045. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 245 + 331 = 576. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 562 + 356 = 918. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 922 + 513 = 1435. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 547 + 481 = 1028. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 92 × 53 = 4874. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 28 × 62 = 1732. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 96 × 24 = 2307. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 80 × 81 = 6480. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 462 + 443 = 902. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 217 + 251 = 468. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 333 + 829 = 1160. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 87 × 15 = 1305. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 218 + 536 = 748. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 782 + 324 = 1106. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 228 + 516 = 744. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 628 + 392 = 1020. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 97 × 89 = 8628. Correct or wrong? (a) correct (b) wrong

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