What number does point 𝐶 represent
on the line?
First, we identify point 𝐶. We can use the rest of the
information on the number line to solve for the number of point 𝐶. If you notice the two numbers after
point 𝐶, you’ll see that we’re going from 770 to 776. From one dash to the next, we’ve
added seven units. And that means, from point 𝐶 to the
number 770 is an increase of seven units.
But we want to go backwards. We want to start at 770 and move to
point 𝐶, move in the left direction seven units. Moving to the left seven units is
the same thing as subtracting seven. We take the number 770 and subtract
Starting in the units place, we
can’t subtract seven from zero. So we borrow from our tens
place. That leaves us with six tens and
ten ones. From there, we can say 10 minus
seven equals three. We bring down the six from our tens
place and bring down the seven from our hundreds place. This tells us that point 𝐶 is equal