Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 813 · 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: 40 × 70 = 2800. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 14 × 47 = 658. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 684 + 651 = 1329. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 635 + 707 = 1349. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 694 + 375 = 1066. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 880 + 548 = 1428. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 23 × 16 = 363. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 74 × 58 = 4288. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 17 × 21 = 357. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 14 × 63 = 886. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 957 + 278 = 1230. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 341 + 179 = 523. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 54 × 88 = 4754. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 207 + 451 = 658. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 51 × 40 = 2040. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 305 + 220 = 527. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 50 × 59 = 2950. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 942 + 660 = 1602. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 68 × 56 = 3809. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 12 × 91 = 1096. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 20 × 23 = 460. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 264 + 659 = 923. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 712 + 293 = 998. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 564 + 894 = 1458. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 92 × 35 = 3225. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 78 × 55 = 4290. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 998 + 568 = 1566. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 242 + 741 = 983. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 87 × 75 = 6525. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 697 + 187 = 887. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 591 + 343 = 929. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 122 + 234 = 356. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 943 + 532 = 1476. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 43 × 79 = 3397. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 625 + 212 = 837. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 695 + 691 = 1386. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 262 + 299 = 561. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 27 × 79 = 2133. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 922 + 261 = 1183. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 524 + 444 = 968. Correct or wrong? (a) wrong (b) correct

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