WEBVTT
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Complete the following.
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70 subtract 50 equals what.
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We can model the number 70 using 10s blocks.
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How many 10s do we need to make the number 70?
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There are seven 10s and no ones.
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10, 20, 30, 40, 50, 60, 70.
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We have to subtract 50.
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If we subtract 10, we’re left with 60.
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We subtracted two 10s, which is 20.
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Now, we’ve subtracted 30, 40, 50.
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We had seven 10s.
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We subtracted five 10s.
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And we’re left with two 10s.
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Two 10s are 20.
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So, 70 subtract 50 equals 20.