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Ms. Jones has 54 pencils. She gave 17 of the pencils to her students. How many pencils does Ms. Jones have left? Show how to subtract two-digit numbers by adding up.

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 54

- 17

------

 37


 xy

+17

----

54

x +7 = 4

7  carry a 1

y + 1 + carry =5

y =3

xy = 37

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