Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 276 · 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: 789 + 921 = 1710. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 87 × 90 = 7824. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 274 + 125 = 402. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 727 + 573 = 1303. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 372 + 853 = 1225. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 360 + 188 = 548. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 29 × 53 = 1529. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 735 + 359 = 1096. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 717 + 745 = 1466. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 86 × 94 = 8089. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 63 × 85 = 5354. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 85 × 91 = 7735. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 66 × 64 = 4224. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 200 + 703 = 901. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 25 × 90 = 2250. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 50 × 83 = 4157. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 987 + 625 = 1612. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 240 + 357 = 597. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 23 × 32 = 729. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 572 + 447 = 1024. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 54 × 27 = 1452. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 650 + 275 = 919. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 249 + 795 = 1042. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 21 × 16 = 336. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 202 + 712 = 913. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 52 × 58 = 3016. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 470 + 310 = 775. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 72 × 97 = 6984. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 66 × 23 = 1523. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 34 × 16 = 538. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 60 × 77 = 4620. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 31 × 52 = 1612. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 501 + 887 = 1388. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 28 × 38 = 1064. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 838 + 138 = 976. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 542 + 161 = 696. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 97 × 91 = 8827. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 53 × 62 = 3286. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 39 × 26 = 1014. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 310 + 408 = 718. Correct or wrong? (a) wrong (b) correct

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