Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 342 · 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: 43 × 32 = 1375. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 388 + 813 = 1209. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 306 + 348 = 656. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 40 × 17 = 680. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 805 + 458 = 1268. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 274 + 207 = 482. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 420 + 321 = 734. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 46 × 59 = 2716. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 779 + 675 = 1454. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 22 × 60 = 1320. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 167 + 967 = 1134. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 898 + 993 = 1891. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 573 + 361 = 935. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 469 + 725 = 1194. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 459 + 297 = 756. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 59 × 18 = 1062. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 46 × 86 = 3957. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 59 × 78 = 4607. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 97 × 34 = 3298. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 40 × 85 = 3400. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 396 + 714 = 1110. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 37 × 84 = 3108. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 88 × 32 = 2816. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 227 + 785 = 1017. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 64 × 29 = 1858. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 27 × 23 = 621. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 671 + 135 = 806. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 948 + 204 = 1149. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 48 × 53 = 2547. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 45 × 24 = 1075. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 61 × 95 = 5798. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 571 + 957 = 1528. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 40 × 79 = 3160. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 123 + 952 = 1075. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 392 + 280 = 672. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 192 + 405 = 598. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 64 × 12 = 775. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 47 × 34 = 1598. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 210 + 543 = 760. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 514 + 130 = 644. Correct or wrong? (a) wrong (b) correct

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