Use knowledge of subtraction facts within 10 to subtract within 20
Lesson 1 / 10
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Lesson outcome
I can use knowledge of subtraction facts within 10 to subtract within 20
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Subtraction facts within ten can be applied to subtraction within 20, e.g. if 5 - 2 = 3 then 15 - 2 = 13
A number line can be used to show the link between subtraction of one-digit numbers and teen numbers.
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