Xiao Yuan, a third grader, planted a small pine tree with a height of 7 decimeters last year. Now it has grown to a height of 1.2 decimeters. How tall has this small pine tree grown?
三年级的小元去年种了一棵7分米高的小松树，现在已长到1米2分米高了，这棵小松树长高了多少？
<gadget id="calculator">12 - 7</gadget>
<output>5</output>

<result>5</result>