Jack sews 3 shirts for each of his 3 kids. He sews 7 buttons in each shirt. How many buttons must Jack use for all the shirts?
The total number of shirts for all his kids is 3 * 3 = <<3*3=9>>9 shirts.
The total number of needed buttons is 9 * 7 = <<9*7=63>>63 buttons.
#### 63