You can put this solution on YOUR website! Test the numbers and you will find the answer.
What is 5^2 and 6^2? Does 51 lie between these numbers?
what about 6^2 and 7^2?
Do this for each set of numbers until you find the answer.
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If you need more help, I will be happy to help you. Just email me and we can talk through these problems. I am not sure what you tried to do in order to solve this on your own though and part of math is developing the thinkings skills to figure things out on your own.
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Justin