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I have 7 base-ten blocks. Some are longs and some are units. Their value is an even number between 40 and 60 . What blocks do I have?
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Study Figure $24.19 .$ The four rows of white blocks at the top represent the numbers $1-10 .$ The bottom row is a placeholder and the top three rows are the actual counting. Explain the "rule" for the kind of counting shown here. (For example, how do three white blocks represent the number 7 ?
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