Multiplication squares

This task is about using numbers to complete some multiplication arrays.
Using multiplication, fill in the squares in the boxes below so that:
  

•    the numbers across each row multiply to the product at the end of the row, and
•    the numbers down each column also multiply to the product at the bottom of each column.
•    Only the numbers 1-10 can be used. The same number can be used more than once.

  

a)

multiplication square

b) multiplication square
c) multiplication square