Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 437 · 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 × 14 = 514. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 20 × 28 = 560. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 279 + 283 = 562. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 17 × 34 = 580. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 271 + 830 = 1101. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 187 + 699 = 886. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 55 × 26 = 1430. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 24 × 77 = 1849. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 223 + 469 = 692. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 20 × 51 = 1023. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 47 × 96 = 4512. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 144 + 897 = 1034. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 44 × 52 = 2288. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 513 + 204 = 717. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 793 + 166 = 958. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 66 × 34 = 2249. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 30 × 87 = 2610. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 214 + 248 = 462. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 34 × 83 = 2822. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 42 × 99 = 4158. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 194 + 511 = 705. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 862 + 205 = 1067. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 884 + 921 = 1805. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 64 × 63 = 4030. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 80 × 76 = 6077. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 938 + 311 = 1249. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 24 × 24 = 576. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 737 + 571 = 1302. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 79 × 78 = 6167. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 52 × 96 = 4992. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 40 × 23 = 921. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 13 × 26 = 338. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 234 + 621 = 855. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 16 × 67 = 1072. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 331 + 531 = 866. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 97 × 15 = 1455. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 37 × 88 = 3253. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 713 + 644 = 1357. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 97 × 72 = 6979. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 12 × 92 = 1104. Correct or wrong? (a) wrong (b) correct

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