Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 901 · 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: 80 × 36 = 2888. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 44 × 21 = 923. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 67 × 25 = 1682. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 190 + 331 = 521. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 519 + 730 = 1241. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 20 × 33 = 660. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 48 × 42 = 2016. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 33 × 31 = 1023. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 47 × 96 = 4512. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 188 + 211 = 399. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 70 × 50 = 3501. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 120 + 434 = 560. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 292 + 169 = 456. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 79 × 66 = 5214. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 50 × 43 = 2150. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 148 + 725 = 873. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 44 × 54 = 2380. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 530 + 250 = 774. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 451 + 769 = 1217. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 97 × 85 = 8245. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 373 + 533 = 902. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 821 + 601 = 1422. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 212 + 141 = 358. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 67 × 80 = 5360. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 23 × 43 = 983. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 34 × 82 = 2788. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 92 × 83 = 7632. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 775 + 723 = 1498. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 334 + 260 = 597. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 63 × 92 = 5796. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 39 × 92 = 3584. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 82 × 27 = 2214. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 316 + 282 = 597. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 18 × 47 = 842. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 20 × 86 = 1718. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 16 × 56 = 899. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 837 + 152 = 992. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 64 × 64 = 4097. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 24 × 22 = 528. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 950 + 712 = 1660. Correct or wrong? (a) correct (b) wrong

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