Expanded form subtraction is a method where we break numbers into their place values (hundreds, tens, and ones) before subtracting. This helps us understand how subtraction works with each place value.
Expanded form makes large numbers easier to work with by showing the value of each digit separately.
When each digit in the top number is larger than the digit below it, we can subtract directly without changing the numbers.
Always check that each place value in the first number is larger before subtracting directly.
Regrouping (sometimes called borrowing) happens when a digit in the top number is smaller than the digit below it. We need to adjust the numbers before we can subtract.
When regrouping, remember you're moving value from one place value to another, not just changing numbers.
Sometimes we need to regroup more than once when multiple place values need adjustment before subtracting.
Take your time with double regrouping. Work step by step to avoid mistakes.
When numbers have zeros in the tens or ones place, we need to regroup carefully to make subtraction possible.
Zeros tell us we definitely need to regroup from a higher place value.