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This is NOT a lesson for kids in your class. Instead this is an explanation for parents of your students who want to know what to buy. (As a retired science teacher, I hae forgotten how many parents asked me that question.)
The truth of the matter is that department store telescopes are not recommended. They are usually made out of plastic and probably include three eyepieces (two of which you might consider throwing away.) The discussion goes into detail of power on how big of a picture you can see SHARPLY based on a rule astronomers use based on the diameter of the front lens.
Once the flaws of department telescopes are discussed, consideration is given for the purchase of a good pair of BINOCULARS. I will not tell what brands to purchase, only suggest you look at quality instruments made in Japan or Germany.
Attention is given to types of binoculars - what the numbers mean, type of focusing, individual eye focus and the possible selection of prism binoculars.
When a youngster wants more than what binoculars can see, it may be time for a telescope. I would suggest that you might want to look at Amazon, com for reflecting (mirror) telescopes. There are several good ones that are in the $100 range.