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The Number Line (as shown above) can be used to show the subtraction of two
numbers.
To subtract 3
from
10 , begin at 0
and draw an arrow 10
units long, moving to the
right, which represents 10. From the tip
of the arrow draw (subtract) another arrow 3
units long moving left.
The tip of this second arrow now points the result
which is 7.
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