Put a decimal point at the correct place in the product - $2.5 \times 3.5 = 875$

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Solution

Placing the decimal at the correct place in the product-
Count the number of digits after the decimal point in both the numbers, we have $1$ digit after decimal in $2.5$ and $1$ digit in $3.5$
So, place the decimal after two digits from the right in the product. $[∵ 1 + 1 = 2]$
Therefore,
$2.5 \times 3.5 = 8.75$
Hence, the product of $2.5 \times 3.5$ is $8.75$

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