*You cannot take 9 ones away from 3 ones, so you need to get more ones.
*You cannot take any ones from 0 tens, so you skip to the hundreds. That makes 3 hundreds and 13 ones.
*You subtract 9 ones from 13 ones to get 4 tens.
*You subtract 0 tens from 0 tens to get 0 tens.
*You subtract 2 hundreds from 3 hundreds to get 1 hundred.
*You subtract 3 thousands from 6 thousands to get 3 thousands.
Part A:
Explain what is correct about the reasoning the student used to subtract the numbers.
3 points
3
Question 2
2.
A student solves this subtraction problem:
This is the reasoning the student used.
*You cannot take 9 ones away from 3 ones, so you need to get more ones.
*You cannot take any ones from 0 tens, so you skip to the hundreds. That makes 3 hundreds and 13 ones.
*You subtract 9 ones from 13 ones to get 4 tens.
*You subtract 0 tens from 0 tens to get 0 tens.
*You subtract 2 hundreds from 3 hundreds to get 1 hundred.
*You subtract 3 thousands from 6 thousands to get 3 thousands.
Part B:
Explain the error in the reasoning the student used to subtract the numbers. Then explain how to correct the error. Include the correct difference in your explanation.