Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 331 · 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: 371 + 274 = 645. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 40 × 63 = 2525. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 968 + 390 = 1359. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 39 × 55 = 2145. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 58 × 86 = 4991. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 250 + 963 = 1213. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 986 + 700 = 1686. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 40 × 24 = 960. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 351 + 201 = 560. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 904 + 278 = 1186. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 491 + 695 = 1178. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 686 + 705 = 1394. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 241 + 185 = 426. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 772 + 127 = 899. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 809 + 158 = 970. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 439 + 523 = 963. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 52 × 61 = 3172. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 43 × 55 = 2372. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 235 + 478 = 713. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 470 + 524 = 986. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 191 + 207 = 406. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 97 × 81 = 7857. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 703 + 205 = 909. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 772 + 212 = 978. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 324 + 221 = 537. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 263 + 492 = 762. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 35 × 13 = 455. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 29 × 69 = 2001. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 998 + 483 = 1481. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 52 × 19 = 988. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 239 + 590 = 829. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 29 × 97 = 2813. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 30 × 81 = 2430. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 81 × 89 = 7216. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 868 + 533 = 1401. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 13 × 56 = 728. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 976 + 527 = 1498. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 23 × 40 = 928. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 75 × 22 = 1657. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 28 × 22 = 616. Correct or wrong? (a) wrong (b) correct

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