The two parts to this step include the following -
1. Using your choice of your coordinating fabrics add a number to three of the blocks.
Challenge - think outside the box here. How can you represent a number without actually using numbers? Words, an actual number, pick an item or shape that you like and do it in multiples - what other ways can you come up with to represent a number?
2. Using a single coordinating fabric, add a square to three different blocks.
Thinking outside of the box - will you add three squares? Have one square that touches more than one square? will it be flat or have texture? What kind of fun can you add to a simple square?