Cut a rectangular iron plate with a length of 90 cm and a width of 42 cm into small square iron plates whose side lengths are integer centimeters and have equal areas.
把一块长90厘米、宽42厘米的长方形铁板剪成边长都是整数厘米、面积都相等的小正方形铁片，恰无剩余，至少要剪多少块．
<gadget id="calculator">90 / 6</gadget>
<output>15</output>

<gadget id="calculator">42 / 6</gadget>
<output>7</output>

<gadget id="calculator">15 * 7</gadget>
<output>105</output>

<result>105</result>