Author Question: By the age of ____ years, most children have learned the addition tables so well that the sums of ... (Read 47 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?

By definition, when a medication is administered intravenously, its bioavailability is 100%.

Did you know?

Green tea is able to stop the scent of garlic or onion from causing bad breath.

Did you know?

The liver is the only organ that has the ability to regenerate itself after certain types of damage. As much as 25% of the liver can be removed, and it will still regenerate back to its original shape and size. However, the liver cannot regenerate after severe damage caused by alcohol.

Did you know?

The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.

Did you know?

It is widely believed that giving a daily oral dose of aspirin to heart attack patients improves their chances of survival because the aspirin blocks the formation of new blood clots.

For a complete list of videos, visit our video library