Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 520 · 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: 425 + 352 = 776. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 608 + 778 = 1386. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 13 × 35 = 456. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 79 × 36 = 2839. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 80 × 91 = 7281. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 769 + 298 = 1066. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 666 + 995 = 1666. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 39 × 76 = 2966. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 37 × 77 = 2852. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 655 + 494 = 1142. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 219 + 995 = 1213. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 336 + 752 = 1090. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 98 × 28 = 2746. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 61 × 53 = 3233. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 499 + 361 = 867. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 190 + 509 = 699. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 15 × 97 = 1455. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 81 × 97 = 7854. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 231 + 235 = 466. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 36 × 63 = 2265. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 88 × 37 = 3256. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 78 × 20 = 1560. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 549 + 650 = 1197. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 239 + 862 = 1098. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 79 × 77 = 6087. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 319 + 788 = 1102. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 583 + 794 = 1377. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 16 × 26 = 416. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 770 + 792 = 1557. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 17 × 63 = 1069. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 76 × 49 = 3718. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 503 + 584 = 1087. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 231 + 201 = 440. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 59 × 38 = 2237. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 226 + 368 = 595. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 18 × 64 = 1152. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 78 × 34 = 2656. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 55 × 66 = 3622. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 84 × 33 = 2772. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 577 + 266 = 847. Correct or wrong? (a) correct (b) wrong

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