The following abilities of school-age children are true EXCEPT

A) by 6 or 7, many children can count in their heads.
B) the ability to add numbers appears before subtraction.
C) the ability to estimate does not change significantly during middle childhood.
D) children become more adept with age at solving story problems.

Metamemory

Understanding of processes of memory.

Working Memory

A cognitive system responsible for temporarily holding information available for processing, important for reasoning and the guidance of decision-making and behavior.

Phone Number

A sequence of digits assigned to a telephone line that enables it to be reached from other telephones.