Subtract a one-digit number from a two-digit number – with regrouping

key notes :

Understanding Regrouping (Borrowing):

• When the digit in the ones place of the two-digit number is smaller than the one-digit number, we need to regroup (borrow) from the tens place.

Steps for Subtracting with Regrouping:

• Step 1: Look at the ones place. If the top number (minuend) in the ones place is smaller than the bottom number (subtrahend), you will need to borrow from the tens place.
• Step 2: Regroup by borrowing 1 from the tens place. This means taking 10 from the tens and adding it to the ones place of the minuend.
• Step 3: Subtract the numbers in the ones place.
• Step 4: Subtract the tens place after borrowing.

Example:

Example 1: 52 – 8

• In this case, 2 (ones place) is smaller than 8, so we borrow 1 from the 5 in the tens place, making the 2 become 12.
• Now, 12 – 8 = 4.
• Then subtract 4 from 4 (tens place): 4 – 0 = 4.
• Final answer: 44.

Learn with an example

Let’s practice!