Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 822 · 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: 88 × 33 = 2904. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 199 + 908 = 1109. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 37 × 72 = 2664. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 30 × 56 = 1681. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 78 × 58 = 4524. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 218 + 809 = 1027. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 662 + 232 = 894. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 23 × 63 = 1441. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 290 + 277 = 565. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 963 + 203 = 1166. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 60 × 99 = 5933. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 859 + 564 = 1423. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 930 + 268 = 1198. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 633 + 834 = 1475. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 281 + 312 = 593. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 281 + 397 = 678. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 41 × 16 = 649. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 61 × 96 = 5852. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 63 × 15 = 938. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 813 + 744 = 1557. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 33 × 51 = 1683. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 449 + 725 = 1174. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 16 × 72 = 1145. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 77 × 59 = 4540. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 297 + 409 = 713. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 813 + 894 = 1714. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 926 + 623 = 1549. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 91 × 12 = 1096. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 649 + 999 = 1648. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 91 × 44 = 4011. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 162 + 675 = 838. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 25 × 78 = 1956. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 48 × 22 = 1056. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 939 + 902 = 1841. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 61 × 61 = 3721. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 20 × 66 = 1320. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 155 + 279 = 434. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 72 × 44 = 3164. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 29 × 27 = 778. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 75 × 43 = 3221. Correct or wrong? (a) correct (b) wrong

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