## Subtraction with Regrouping

Regrouping in subtraction is a process of exchanging one tens into ten ones. We use regrouping in subtraction when the minuend is smaller than the subtrahend.

**Uses of subtraction with regrouping**

Subtraction with regrouping is very useful in our daily life. Some examples are given below:

1. To measure distance

2. To deal with money

3. To measure time

**Using subtraction with regrouping**

We use subtraction with regrouping to work out different subtraction problems.

For example, Ray buys chocolates worth $47. He pays by giving a $50 bill. How much money will he get back?

Ray pays $50, means 5 tens and 0 ones. He bought chocolates worth $47, means 4 tens and 7 ones. Here we can see the minuend (0) is smaller than the subtrahend (7). We can regroup them by borrowing 1 ten to make ten ones.

Ray has $3 left with him.

Example 2: 542 – 136

Example 2: In a school, there are 785 students, and 468 of them are girls. Find the number of boys in the school?

Total number of students = 785

Number of girls in the school = 468

Number of boys in the school = 785 – 468 = 317

Fun Facts– We can always check our answer by adding the subtrahend and the difference to get the minuend as addition is the inverse of subtraction. |