Estimate the value of the product by frist rounding the numbers.<hr> 54 x 45 = <input min="0" type="number" id="imp4pg022q8b_1" class="lineinput" placeholder="?"> x <input min="0" type="number" id="imp4pg022q8b_2" class="lineinput" placeholder="?"> <br>= <input min="0" type="number" id="imp4pg022q8b_3" class="lineinput" placeholder="?">