Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 63 · 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: 207 + 661 = 868. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 817 + 432 = 1249. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 97 × 83 = 8044. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 253 + 925 = 1181. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 37 × 13 = 475. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 492 + 812 = 1304. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 999 + 973 = 1972. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 546 + 158 = 709. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 755 + 399 = 1152. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 43 × 39 = 1673. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 946 + 604 = 1550. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 971 + 132 = 1110. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 983 + 596 = 1583. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 369 + 165 = 534. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 32 × 85 = 2722. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 18 × 95 = 1710. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 97 × 36 = 3485. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 53 × 16 = 848. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 41 × 99 = 4054. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 92 × 71 = 6532. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 71 × 81 = 5751. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 139 + 509 = 648. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 228 + 906 = 1134. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 16 × 74 = 1184. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 33 × 86 = 2838. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 830 + 140 = 970. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 46 × 84 = 3864. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 78 × 88 = 6860. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 338 + 172 = 509. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 83 × 97 = 8051. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 30 × 39 = 1166. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 67 × 32 = 2144. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 90 × 20 = 1800. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 331 + 383 = 714. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 408 + 353 = 768. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 239 + 328 = 567. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 12 × 33 = 388. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 40 × 36 = 1440. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 33 × 81 = 2673. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 19 × 25 = 474. Correct or wrong? (a) wrong (b) correct

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