Before beginning this exercise, you must first explain to your children what an array is. Use this worksheet to teach them that an array is a group of objects, pictures, or numbers in columns and rows. A rectangular array is a group of objects that are arranged in equal rows and columns. Make sure your child understands and remembers this. Then, ask your child to look at the pictures in the printout and see if they can point out any that show rectangular arrays. Help them check the pictures.