Estimate the value by rounding each digit to the nearest hundred first. <br> 291 + 108 + 387 = <input min="0" type="number" id ="imp4pg005q4a_1" class="lineinput" placeholder="?" /> + <input min="0" type="number" id ="imp4pg005q4a_2" class="lineinput" placeholder="?" /> + <input min="0" type="number" id ="imp4pg005q4a_3" class="lineinput" placeholder="?" /> = <input min="0" type="number" id ="imp4pg005q4a_4" class="lineinput" placeholder="?" />