Sally sews 4 shirts on Monday, 3 shirts on Tuesday, and 2 shirts on Wednesday.  Each shirt has 5 buttons.  How many buttons does Sally need to sew all the shirts?
Total number of shirts Sally sews is 4 + 3 + 2 = <<4+3+2=9>>9 shirts.
The total number of buttons she needs is 9 x 5 = <<9*5=45>>45 buttons.
#### 45