Video Transcript
What is 13 minus four? 13 minus four equals what. Hint: Finish the calculation on the
number line. How many more do you have to take
away?
We’re being asked to calculate 13
take away four using a number line. We’ve started to count back from 13
on the number line. We’ve counted back three spaces,
and we’ve landed on number 10. We need to subtract four. We’ve already subtracted three. How many more do we need to
subtract?
We know that three and one makes
four, so we need to subtract one more. We landed on number nine. 13 minus four is nine. First, we subtracted three to take
us to 10. Then we subtracted one more. To subtract four, first we can
subtract three and then subtract one more. 13 minus four is nine.
