Estimate the value by rounding first digit to the nearest ten first.. <br> 215 x 7 = <input min="0" type="number" id ="imp4pg005q4d_1" class="lineinput" placeholder="?" /> x <input min="0" type="number" id ="imp4pg005q4d_2" class="lineinput" placeholder="?" /> = <input min="0" type="number" id ="imp4pg005q4d_3" class="lineinput" placeholder="?" />