3-Digit Add and Subtract with Regrouping

Front

What is regrouping in addition?

Back

Regrouping in addition is when you combine groups of ten to make a larger number. For example, if you add 27 + 35, you can regroup the tens to make it easier.

Front

What is regrouping in subtraction?

Back

Regrouping in subtraction is when you borrow from a higher place value to subtract a smaller number. For example, in 52 - 27, you would borrow from the 5 to subtract 2 from 12.

Front

What is the sum of 245 and 378?

Back

The sum of 245 and 378 is 623.

Front

What is the difference when you subtract 145 from 300?

Back

The difference when you subtract 145 from 300 is 155.

Front

How do you add 456 and 289 using regrouping?

Back

First, add the ones: 6 + 9 = 15 (write down 5, carry over 1). Then add the tens: 5 + 8 + 1 = 14 (write down 4, carry over 1). Finally, add the hundreds: 4 + 2 + 1 = 7. The answer is 745.

Front

How do you subtract 512 from 700 using regrouping?

Back

First, you can't subtract 2 from 0, so you borrow from the 7 (making it 6) and turn the 0 into 10. Now, 10 - 2 = 8. Next, 6 - 1 = 5. Finally, 6 - 5 = 1. The answer is 188.

Front

What is a three-digit number?

Back

A three-digit number is a number that has three places: hundreds, tens, and ones. For example, 245 is a three-digit number.

Front

What does the term 'sum' mean?

Back

The term 'sum' means the result of adding two or more numbers together.

Front

What does the term 'difference' mean?

Back

The term 'difference' means the result of subtracting one number from another.

Front

What is the first step in adding 3-digit numbers?

Back

The first step in adding 3-digit numbers is to line up the numbers by their place values: hundreds, tens, and ones.