Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 625 · 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: 310 + 662 = 974. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 583 + 818 = 1401. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 92 × 86 = 7912. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 25 × 91 = 2275. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 360 + 984 = 1336. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 885 + 571 = 1455. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 62 × 35 = 2170. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 23 × 57 = 1311. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 742 + 753 = 1496. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 543 + 772 = 1307. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 82 × 80 = 6554. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 99 × 17 = 1683. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 16 × 73 = 1168. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 76 × 76 = 5773. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 456 + 532 = 992. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 329 + 606 = 935. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 905 + 903 = 1808. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 350 + 652 = 1002. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 228 + 771 = 999. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 769 + 277 = 1044. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 370 + 858 = 1228. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 83 × 63 = 5229. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 68 × 65 = 4422. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 898 + 312 = 1214. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 523 + 994 = 1515. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 82 × 81 = 6642. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 516 + 929 = 1447. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 236 + 168 = 400. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 434 + 372 = 806. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 98 × 67 = 6574. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 29 × 23 = 667. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 22 × 97 = 2134. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 545 + 964 = 1509. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 35 × 38 = 1330. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 266 + 236 = 498. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 48 × 95 = 4560. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 35 × 20 = 700. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 36 × 91 = 3283. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 92 × 67 = 6159. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 29 × 42 = 1218. Correct or wrong? (a) correct (b) wrong

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