WEBVTT
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Which number is missing?
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17, 18, 19, the missing number, 21.
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We need to find the number which comes between 19 and 21, or the number that comes after 19 but before 21.
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We could use a hundred square to help us find the missing number.
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We’ve circled number 19.
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So which number comes after 19?
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20.
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The missing number is 20.
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17, 18, 19, 20, 21.