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https://slideshare.net/alanjackson/introduction-to-simplifying-fractions-1177165
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https://mathworksheets4kids.com/fractions/simplify/reduce-1.pdf
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https://brainpop.com/math/numbersandoperations/reducingfractions/
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https://tes.com/lessons/zUyPX-3uEbOEfw/simplifying-fractions
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Khan Academy