Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 641 · 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: 37 × 62 = 2292. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 776 + 189 = 965. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 754 + 278 = 1025. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 33 × 26 = 858. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 526 + 547 = 1073. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 26 × 43 = 1120. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 501 + 380 = 878. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 37 × 61 = 2260. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 805 + 230 = 1041. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 413 + 585 = 998. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 929 + 942 = 1871. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 65 × 99 = 6435. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 13 × 36 = 472. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 44 × 87 = 3828. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 192 + 244 = 436. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 190 + 628 = 818. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 99 × 35 = 3465. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 544 + 146 = 690. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 892 + 711 = 1603. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 68 × 98 = 6664. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 754 + 734 = 1480. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 175 + 930 = 1104. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 141 + 739 = 880. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 43 × 55 = 2364. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 98 × 47 = 4601. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 60 × 41 = 2467. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 666 + 667 = 1333. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 453 + 360 = 814. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 425 + 621 = 1052. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 423 + 461 = 877. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 25 × 73 = 1827. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 760 + 791 = 1551. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 40 × 34 = 1360. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 89 × 31 = 2759. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 562 + 634 = 1204. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 27 × 76 = 2052. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 222 + 221 = 443. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 21 × 34 = 714. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 461 + 453 = 914. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 51 × 78 = 3981. Correct or wrong? (a) wrong (b) correct

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