Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 936 · 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: 17 × 33 = 561. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 732 + 700 = 1432. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 27 × 49 = 1316. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 60 × 40 = 2400. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 481 + 850 = 1331. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 35 × 18 = 628. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 20 × 93 = 1855. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 906 + 351 = 1262. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 897 + 309 = 1203. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 74 × 55 = 4070. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 40 × 67 = 2682. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 989 + 989 = 1978. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 197 + 239 = 436. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 72 × 82 = 5904. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 380 + 291 = 671. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 323 + 225 = 548. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 50 × 66 = 3300. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 685 + 259 = 944. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 343 + 431 = 779. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 40 × 26 = 1040. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 342 + 425 = 767. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 93 × 60 = 5585. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 757 + 265 = 1024. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 49 × 99 = 4851. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 87 × 76 = 6612. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 564 + 331 = 892. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 293 + 582 = 868. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 252 + 975 = 1226. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 51 × 81 = 4123. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 13 × 49 = 642. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 806 + 365 = 1171. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 24 × 15 = 360. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 46 × 93 = 4274. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 641 + 941 = 1582. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 543 + 296 = 845. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 187 + 262 = 442. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 56 × 50 = 2804. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 144 + 636 = 780. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 69 × 15 = 1035. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 653 + 327 = 974. Correct or wrong? (a) correct (b) wrong

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