This understanding treats subtraction as finding the difference between two nonnegative two-digit whole numbers and connects regrouping to place value: when the ones digit is insufficient, one ten is decomposed into ten ones, preserving the total while enabling subtraction. Place-value drawings, equations, and the written algorithm represent the same relationship and prevent treating digits independently; the scope excludes numbers beyond two digits, decimals, and negative results.
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Detailed Explanation: Subtract two 2-digit numbers with regrouping
To subtract two-digit numbers, subtract the ones first and then the tens.
Example:
1. Look at the ones
There are ones in , but we cannot take away ones. Regroup ten as ones.
So, becomes:
- tens
- ones
The total is still the same because ten equals ones.
2. Subtract the ones
Write in the ones place.
3. Subtract the tens
There are tens left:
Write in the tens place.
Therefore,
The difference is .
Learn by doing: Subtract two 2-digit numbers with regrouping
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Practice:
Subtraction - Whole Number 2 x 2, With Borrow
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Download/Modify Free Grade 2 'Subtract two 2-digit numbers with regrouping' Worksheet
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This Worksheet Includes:
- Subtraction - Whole Number 2 x 2, With Borrow
- Subtraction - Whole Number 2 x 2 - Columns, With Borrow
- Subtraction - Whole Number 2 x 2, No Borrow
- Subtraction - Whole Number 2 x 2 - Columns, No Borrow
- Subtraction - Whole Number 2 x 1, With Borrow
- Subtraction - Whole Number 2 x 1 - Columns, With Borrow
- Subtraction - Whole Number 2 x 1, No Borrow
- Subtraction - Whole Number 2 x 1 - Columns, No Borrow
Units Teaching This Skill
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