Final answer:
The toddler should sort the blocks into groups using the GCF of 4, resulting in the expression 4(4+5), which uses the Distributive Property of multiplication over addition.
Step-by-step explanation:
The toddler can sort the 36 blocks into groups using the Greatest Common Factor (GCF) and the Distributive Property of multiplication over addition. First, we need to find the GCF of the number of blue blocks and pink blocks. The GCF of 16 (blue blocks) and 20 (pink blocks) is 4. We can then use the Distributive Property to express the total as a multiplication of the GCF and the sum of the divided parts, which would be 4(4+5) because 16 divided by 4 is 4, and 20 divided by 4 is 5.