The solution to 16 - 20.5 is -4.5.
To represent this on a horizontal number line diagram, we start at 16 and move left (towards the negative direction) by 4.5 units. So, the point representing the solution -4.5 will be to the left of 16 on the number line.
Consider 16–20.5. What is the solution? Represent the subtraction on a horizontal number line diagram.
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