Transformations can be a tricky thing! However if you know a few tips it can be made easy.
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For example, if you have to translate a shape it slides. TranSLate and SLide both had SL in them! It stays the same shape and direction, it just moves, like sliding downa slide. That's what i have found to be the easiest thing to stick in the kids heads has I have helped them with this!
Rotation is rotating a figure around a certain point., as if the figure were dancing in a circle! Just like on a merry-go-round! You can sit on the end of the toy and twirl around the center. All you never change neither will shape. The corner/side that is facing the middle will always face the middle.
Refelction is like a mirror. When the shape gets reflected over a line its like us looking into a mirror. Its the exact oppisite. everything is the same but on the other side.