Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 37 · 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: 23 × 87 = 2001. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 66 × 80 = 5288. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 332 + 155 = 488. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 835 + 176 = 1011. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 83 × 17 = 1411. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 214 + 221 = 435. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 39 × 49 = 1906. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 19 × 20 = 380. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 54 × 32 = 1728. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 90 × 16 = 1440. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 776 + 878 = 1655. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 50 × 28 = 1408. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 91 × 91 = 8281. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 382 + 181 = 563. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 52 × 90 = 4680. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 76 × 28 = 2127. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 313 + 320 = 633. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 91 × 56 = 5096. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 92 × 19 = 1748. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 20 × 72 = 1440. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 68 × 50 = 3400. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 757 + 269 = 1020. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 60 × 80 = 4800. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 419 + 674 = 1085. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 56 × 73 = 4087. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 26 × 58 = 1508. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 324 + 160 = 484. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 834 + 521 = 1355. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 18 × 30 = 537. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 29 × 19 = 556. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 41 × 83 = 3403. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 831 + 319 = 1150. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 81 × 82 = 6642. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 97 × 39 = 3783. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 46 × 47 = 2162. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 16 × 37 = 592. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 488 + 627 = 1123. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 43 × 49 = 2110. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 91 × 22 = 2002. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 37 × 92 = 3404. Correct or wrong? (a) wrong (b) correct

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