Common developmental tasks for a 2 year-old include all EXCEPT:

In assessing the developmental milestones for a 2-year-old, it is important to recognize the typical skills and abilities that children of this age are expected to exhibit.

A key aspect of development at this age includes gross and fine motor skills, language development, and social interaction. Stacking 5 blocks is a fine motor skill that demonstrates a child's hand-eye coordination and dexterity, which is common for toddlers as they begin to engage in more complex play activities. Additionally, following 2-step commands, such as "pick up the ball and put it on the table," indicates an understanding of language and the ability to process instructions, which is also a developmental milestone by age 2. The use of 2-word phrases marks a significant advancement in language skills, showing that children are beginning to form simple sentences to express their needs or observations.

On the other hand, calculating simple math problems is not a developmentally appropriate task for a 2-year-old. At this age, children are not typically engaged in formal mathematical concepts or operations; instead, they are focused on understanding the world around them through play and basic interactions. Their cognitive development allows them to understand simple quantities, but formal math skills do not develop until later in childhood when they have a fir