Read the story.
Baldwin bought 5 packs of wooden pencils. Each pack had 12 pencils in it. He also used a coupon for 4 free mechanical pencils.
Which expression tells you the total number of pencils that Baldwin got?
5 packs of wooden pencils x 12 pencils per pack + 4 free mechanical pencils = Total number of pencils Baldwin got
Therefore, the expression is:
5 x 12 + 4 = 64. Baldwin got a total of 64 pencils.