Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 62 · 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: 253 + 812 = 1065. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 27 × 74 = 2001. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 91 × 29 = 2639. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 682 + 167 = 849. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 213 + 859 = 1074. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 340 + 215 = 550. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 36 × 53 = 1908. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 72 × 43 = 3091. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 401 + 139 = 540. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 674 + 377 = 1054. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 846 + 246 = 1093. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 200 + 862 = 1055. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 53 × 20 = 1054. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 831 + 496 = 1329. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 49 × 88 = 4314. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 514 + 179 = 696. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 81 × 44 = 3564. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 78 × 40 = 3117. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 80 × 18 = 1440. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 154 + 442 = 596. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 789 + 643 = 1433. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 602 + 193 = 795. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 587 + 551 = 1138. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 279 + 559 = 831. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 309 + 201 = 509. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 53 × 71 = 3768. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 438 + 308 = 746. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 577 + 556 = 1133. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 54 × 87 = 4698. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 35 × 73 = 2555. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 856 + 143 = 991. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 900 + 789 = 1692. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 503 + 465 = 968. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 51 × 25 = 1270. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 861 + 273 = 1132. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 567 + 763 = 1338. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 233 + 798 = 1035. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 446 + 549 = 990. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 84 × 57 = 4788. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 664 + 419 = 1083. Correct or wrong? (a) wrong (b) correct

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