Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 87 · 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: 251 + 142 = 389. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 71 × 75 = 5320. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 77 × 58 = 4466. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 745 + 356 = 1107. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 80 × 26 = 2077. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 67 × 90 = 6037. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 32 × 92 = 2944. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 581 + 271 = 852. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 40 × 72 = 2880. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 88 × 60 = 5280. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 560 + 328 = 888. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 29 × 35 = 1023. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 86 × 90 = 7740. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 569 + 869 = 1435. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 84 × 52 = 4370. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 28 × 48 = 1344. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 385 + 872 = 1257. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 98 × 19 = 1862. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 457 + 426 = 883. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 26 × 24 = 617. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 26 × 37 = 966. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 130 + 365 = 495. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 85 × 63 = 5355. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 291 + 299 = 593. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 668 + 737 = 1398. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 810 + 273 = 1083. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 21 × 21 = 441. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 40 × 33 = 1312. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 890 + 318 = 1213. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 179 + 782 = 965. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 949 + 553 = 1504. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 157 + 669 = 824. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 59 × 34 = 2006. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 593 + 882 = 1469. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 307 + 357 = 664. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 37 × 61 = 2253. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 682 + 165 = 847. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 138 + 519 = 657. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 20 × 21 = 420. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 46 × 87 = 3995. Correct or wrong? (a) wrong (b) correct

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