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Connecting fractions to anything is always a good idea - the better students understand fractions, have a good sense of their value, and especially know how to convert and compare them to decimal numbers, are all very important. I would start by showing examples of whole numbers as fractions, simple decimals as fractions, and then move on to more complicated rational numbers as fractions and finally irrational numbers as fractions (pi is always a good choice for this last one). Teach students how to convert a fraction to a decimal and then a decimal to a fraction. Repeating decimal to fractions can be a little tricky but using an algebraic approach if students are familiar with simple algebra, is a great way to do this.
Hope this helps!
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