Open Middle®
Directions: Using the digits 1 to 9, at most one time each, fill in the boxes so that you would not need to regroup when you subtract. Make sure your number is less than 63.
Extension: Explain why you do NOT need to regroup using your number.
Hint
What is a number you can take away from 3?
Answer
The student puts in a number less than 63 and contains a 0, 1, 2, or 3 in the ones place.
Source: Chase Orton
Does not come up as a PDF
63-52
63-12
63-45
63 – 51
63-42
63-31
63-21
63 – 32
63-53
63-51
63-42
63-12
63-51
I wonder if anyone from a middle school background wrote 63 – (-5). It meets the qualifications.
63-12, since there are less ones in 12 then 63 i do not have to regroup
63-41 would not require regrouping because the number to subtract has a value in both the ones and tens place that is less than the greater number. 1 < 3 and 4 < 6 This way no regrouping is required to solve the problem.
63-23. No need to regroup since there are two 3’s in the ones place that will give a 0 and in the tens place you have 6-2, which will give a 4
I need to make sure i am subtracting numbers less than the number in each place value.
63-23
Ones place must have a number that is the same or less value so you won’t have to rename/regroup
63-52
63-21
63-41
63-1=62
63-52=11
63-52=11
The number must be smaller than 63 and have a smaller number than 3 in the ones place in order to have no regrouping.
63-03 will not need regrouping because subtracting 3 form 3 in the ones place value gives a value of zero and leave 6 in the tens place
63-52=11
The numbers are smaller than the numbers in the tens and ones column.
63-10=53
No regrouping is required because the number on top is bigger or equal than the number that is being taken away.
63 – 42
63-21
63-21
You do nor need to regroup because 2 is less than 6 in the tens spot and 1 is less than 3 in the ones spot. So the asnwer is 42. You can solve the problem without regrouping.
63-21
You do not need to regroup because 2 is less than 6 in the tens spot and 1 is less than 3 in the ones spot. So the asnwer is 42. You can solve the problem without regrouping.
I messed up with 63 – 0, sorry that is incorrect as it is the same as 63, not less
63-12
Just thought of two numbers (tens place and ones place) that were less than “6” and 3″.