Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 601 · 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: 49 × 89 = 4361. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 57 × 32 = 1824. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 178 + 578 = 760. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 939 + 174 = 1113. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 291 + 182 = 471. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 902 + 804 = 1706. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 608 + 491 = 1096. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 54 × 22 = 1193. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 489 + 344 = 833. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 82 × 25 = 2050. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 750 + 170 = 928. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 137 + 581 = 718. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 70 × 62 = 4348. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 262 + 120 = 382. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 44 × 31 = 1364. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 609 + 622 = 1231. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 401 + 182 = 583. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 45 × 65 = 2925. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 66 × 48 = 3168. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 927 + 173 = 1101. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 575 + 326 = 901. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 755 + 883 = 1631. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 75 × 93 = 6975. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 154 + 420 = 581. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 49 × 26 = 1274. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 28 × 42 = 1176. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 257 + 869 = 1126. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 563 + 535 = 1101. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 836 + 732 = 1568. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 80 × 82 = 6560. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 70 × 26 = 1814. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 26 × 45 = 1169. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 81 × 60 = 4860. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 69 × 94 = 6491. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 20 × 81 = 1621. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 65 × 54 = 3516. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 204 + 316 = 526. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 46 × 93 = 4278. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 81 × 33 = 2673. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 428 + 820 = 1240. Correct or wrong? (a) correct (b) wrong

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