Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 928 · 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: 807 + 265 = 1072. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 90 × 57 = 5130. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 278 + 136 = 414. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 42 × 19 = 803. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 34 × 97 = 3298. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 179 + 998 = 1177. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 68 × 65 = 4421. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 713 + 268 = 981. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 172 + 172 = 344. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 73 × 26 = 1898. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 784 + 299 = 1083. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 13 × 90 = 1170. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 75 × 86 = 6450. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 20 × 68 = 1360. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 35 × 56 = 1967. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 591 + 974 = 1568. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 319 + 147 = 466. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 16 × 16 = 256. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 159 + 395 = 554. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 840 + 607 = 1454. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 92 × 16 = 1476. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 366 + 270 = 630. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 887 + 824 = 1711. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 53 × 84 = 4452. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 994 + 450 = 1444. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 35 × 41 = 1435. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 524 + 293 = 817. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 170 + 139 = 315. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 41 × 55 = 2258. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 14 × 43 = 604. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 41 × 88 = 3608. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 64 × 45 = 2882. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 96 × 32 = 3078. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 950 + 835 = 1785. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 433 + 607 = 1040. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 175 + 738 = 920. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 33 × 12 = 402. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 978 + 261 = 1239. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 478 + 290 = 776. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 24 × 55 = 1320. Correct or wrong? (a) correct (b) wrong

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