1. The best strategy to use would be to use what you know, such as multiplication facts. You know the square root of say, 40, is not 8 because 8 is the square root of 64. So now you have something to work with. You can set up a boundary. You have 8 and you have a lower number, say 5, because 5 is the square root of 25. You know 40 is in between 64 and 25, and you also know that the square roots are 5 and 8, so now you can narrow it down. You can use this method/strategy for each problem.
Ok, now that you know how you can use it, do you want to figure it out, or do you want me to give you the answer. You said you need to show your work and I think that would be the best way, this way, you don't need to make anything up. It's up to you.
