To find out how many blocks to shade in a 10 by 10 grid to represent 74%, we can follow these steps:
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Calculate the total number of blocks in the grid: \[ 10 \times 10 = 100 \text{ blocks} \]
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Calculate 74% of the total number of blocks: \[ 0.74 \times 100 = 74 \text{ blocks} \]
Therefore, you would shade 74 blocks in the 10 by 10 grid to represent 74%.