Researchers have found when teaching place value concepts, moving quickly from one- or two-digit ...

Researchers have found when teaching place value concepts, moving quickly from one- or two-digit numbers to four-digit numbers:
 
  a. increases the struggle that some children have in developing a clear framework.
  b. helps students construct multi-unit concepts.
  c. de-emphasizes the positional nature of place value.
  d. is not advisable until children reach the second grade.

Question 2...

When children are allowed to approach multi-digit computations on their own, researchers have found:
 
  a. children will universally begin on the left and regroup back and forth until they have found the answer.
  b. the traditional approach yields better results.
  c. they do not apply the concept of place value.
  d. they prefer to use algorithms.

Question 3...

In the base-ten number system, what does zero represent?
 
  a. A quantity or empty set
  b. A notch on a stick
  c. A help with mixed numbers
  d. A unit of 10