Author Question: By the age of ____ years, most children have learned the addition tables so well that the sums of ... (Read 40 times)

saraeharris

  • Hero Member
  • *****
  • Posts: 546
By 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 2

American 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.



ladyjames123

  • Sr. Member
  • ****
  • Posts: 346
Answer to Question 1

a

Answer to Question 2

c



Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
 

Did you know?

Cyanide works by making the human body unable to use oxygen.

Did you know?

Inotropic therapy does not have a role in the treatment of most heart failure patients. These drugs can make patients feel and function better but usually do not lengthen the predicted length of their lives.

Did you know?

Since 1988, the CDC has reported a 99% reduction in bacterial meningitis caused by Haemophilus influenzae, due to the introduction of the vaccine against it.

Did you know?

Individuals are never “cured” of addictions. Instead, they learn how to manage their disease to lead healthy, balanced lives.

Did you know?

Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.

For a complete list of videos, visit our video library