Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 579 · 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: 22 × 78 = 1716. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 858 + 330 = 1191. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 38 × 43 = 1634. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 61 × 74 = 4515. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 581 + 480 = 1061. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 979 + 407 = 1386. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 672 + 532 = 1204. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 71 × 93 = 6602. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 12 × 41 = 492. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 605 + 693 = 1298. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 126 + 965 = 1091. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 435 + 618 = 1053. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 50 × 19 = 956. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 401 + 197 = 599. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 786 + 652 = 1438. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 84 × 34 = 2861. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 793 + 372 = 1165. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 47 × 81 = 3815. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 20 × 30 = 600. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 342 + 555 = 904. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 39 × 54 = 2102. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 958 + 408 = 1363. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 84 × 85 = 7141. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 98 × 39 = 3822. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 42 × 13 = 546. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 12 × 41 = 492. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 99 × 20 = 1972. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 56 × 36 = 2016. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 986 + 473 = 1461. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 257 + 493 = 750. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 81 × 19 = 1545. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 396 + 320 = 716. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 15 × 48 = 720. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 90 × 33 = 2970. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 251 + 558 = 809. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 277 + 745 = 1025. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 306 + 851 = 1157. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 52 × 42 = 2186. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 617 + 196 = 813. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 35 × 47 = 1645. Correct or wrong? (a) wrong (b) correct

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