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157 square inches is about eighteen times as big as a Playing Card.
In other words, the size of a Playing Card is 0.056 times that amount.
(ISO 216 B8 size)
A single ISO 216 B8-size playing card measures 8.70 square inches. Although this size is the most common playing card, many casinos use the smaller "bridge size" card — 4.10 square inches smaller.
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