The correct option is B 308
There were 756 apples on a tree.
448 apples were left on the tree after Amy and her friends picked some of the apples.
So, the number of apples picked by Amy and her friends = (756 − 448) apples
Let’s subtract 448 from 756 using the compensation strategy.
Step 1: Round off 448 to the nearest 10 by adding 2. (The first step is to make the subtrahend a friendly number using addition or subtraction.)
448 + 2 = 450
Step 2: Subtract 450 from 756.
756 − 450 = 306
Step 3: Add 2 to 306.
306 + 2 = 308
So, (756 − 448) apples = 308 apples
So, Amy and her friends picked 308 apples from the tree.