If Toni, who is only six years old, is asked what she would get if she added 5 and 10 together, which of the following processes would she most likely use?
a. She would break the ten down into two fives and then add five together three times.
b. She would start with five and add ten by increasing the sum, one number at a time (e.g., five, six, seven, eight).
c. She would already have memorized that the sum is 15, so she would simply retrieve it form memory rather than calculating the answer.
d. She would start with ten, and add five by increasing the sum one number at a time (e.g., ten, eleven, twelve).
Question 2Approximately ____ as many 15- to 17-year-olds as 12- to 14-year-olds die each year.
a. twice
b. three times
c. four times
d. just
Question 3By the age of ____ years, most children have learned the addition tables so well that the sums of single digit numbers can be retrieved from memory rather than recalculated.
a. eight or nine
b. six or seven
c. five or six
d. three or four
Question 4American teenagers may be less healthy than their parents at the same age because of
a. an increase in the incidence of infectious diseases.
b. an increase in the incidence of physical illnesses.
c. lifestyle and risky behavior.
d. a surge in cases of adolescent cancer.
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