Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 420 · 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: 48 × 91 = 4368. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 34 × 33 = 1122. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 71 × 54 = 3834. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 785 + 937 = 1728. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 63 × 81 = 5103. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 27 × 20 = 540. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 53 × 77 = 4073. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 944 + 644 = 1588. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 576 + 906 = 1481. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 70 × 76 = 5320. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 436 + 815 = 1251. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 97 × 64 = 6208. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 40 × 42 = 1680. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 24 × 62 = 1480. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 45 × 48 = 2158. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 837 + 240 = 1076. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 284 + 786 = 1070. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 21 × 73 = 1537. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 40 × 82 = 3279. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 63 × 44 = 2771. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 348 + 420 = 768. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 65 × 31 = 2015. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 330 + 296 = 626. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 96 × 51 = 4896. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 781 + 259 = 1040. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 324 + 821 = 1145. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 188 + 392 = 580. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 24 × 63 = 1504. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 316 + 292 = 600. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 99 × 57 = 5643. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 70 × 69 = 4837. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 907 + 283 = 1188. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 44 × 44 = 1931. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 864 + 826 = 1696. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 586 + 969 = 1555. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 257 + 999 = 1256. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 38 × 74 = 2813. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 26 × 54 = 1403. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 476 + 821 = 1292. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 82 × 41 = 3362. Correct or wrong? (a) wrong (b) correct

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