The first question is the numbers 16 and above.
Number line!
using a number line you can go from -15 to then go to the right until you get to +1.
Count the spaces.
(You can also think of this as debt which I find much easier.)
The second question would be 14 and under.
Any answer from 14 and under will lead to a negative answer, which is less than 0.
You can use a number line to help you with this one as well,
Start from -15 then go the right until you reach -1.
count the spaces.
The last one is 15.
Number line, once again.
start at -15 then go to the right until you reach 0.
count the spaces.
Hope this helps!
