Which of the Following Is True About the Cognitive Developments

Multiple Choice

Which of the following is true about the cognitive developments related to numbers and math in children?

A) By age 9, most children can count up and down.
B) By age 3 or 4, most children can count in their heads.
C) Most children are adept at solving story problems involving addition and subtraction before the age of 7 or 8.
D) Most children develop some intuitive understanding of fractions after the age of 8 or 9.