Video Transcript
Olivia started at 11 and
counted in 10s until she reached 41. Draw this on a number line. How many jumps of 10 did you
make?
When we count in ones, we
usually just call it counting. But if we ever count in jumps
of another number, we call it skip counting. In this question, Olivia isn’t
counting in ones; she’s counting in 10s. So we can say she’s skip
counting in 10s. We’re told that she started at
11, and she counted in 10s until she reached 41. Now, normally, counting from 11
to 41 might take a little while. But because Olivia is skip
counting in 10s, she’s going to get there quicker.
In the first part of the
question, we’re asked to draw what Olivia does on a number line. So let’s do exactly what she
does. She starts at 11 and counts on
in 10s. Now, we know that number 11 is
made up of one 10 and one one. So, as we count on in 10s, we
need to add one more 10 every time. 11, 21, 31, 41. Did you notice how the number
of ones didn’t change as we added 10? 11, 21, 31, 41. Now that we’ve completed that
number line, we can finish off answering the question because we’re asked, how
many jumps of 10 did we make? We made three jumps of 10. If Olivia starts at 11 and
counts in 10s until she reaches 41, she needs to make three jumps of 10: 11, 21,
31, 41.