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Finding the Square of a Number

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Question

Find numbers from 100 to 400 that end with 0, 1, 4, 5, 6 or 9, which are perfect squares.

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Solution

10² = 100

11² = 121

12² = 144

13² = 169

14² = 196

15² = 225

16² = 256

17² = 289

18² = 324

19² = 361

20² = 400

Therefore, the required numbers are 100, 121, 144, 169, 196, 225, 256, 289, 324, 361 and 400.

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