Sarah understands that if there are 11 ones, the first 10 move over to the tens column as one unit (i.e.,
one group of 10). What concept does this understanding represent?
A. Renaming
B. Regrouping
C. Borrowing
D. Place value
my answer is a
Your answer, A. Renaming, is incorrect.
To find the correct answer, let's break down the given information.
Sarah understands that if there are 11 ones, the first 10 move over to the tens column as one unit (i.e., one group of 10).
This scenario is a classic example of regrouping in place value.
Place value is the concept that the value of a digit depends on its position within a number. In this scenario, the ones column and the tens column are two different positions within a number.
Regrouping, also known as carrying or composing, is a strategy used in place value where you exchange or move groups of equal values from a lower place value to a higher place value. In this case, the 10 ones are regrouped or moved over to the tens column as a group of 10.
Therefore, the correct answer is B. Regrouping.