Starting to work in decimal places is great fun, but I kept coming across the ‘unnecessary zero’ problem: too many of my students were making errors in writing out numbers. They would leave out zeroes that needed to be there (think about .9 instead of 0.9) or alternatively answer 7.100 for a question such as 7100÷100. I created this lesson in order to clarify when a zero should be used, and when it is not necessary.
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