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