Fluently Adding and Subtracting Three-Digit Whole Numbers

Front

What is addition?

Back

Addition is the process of finding the total or sum by combining two or more numbers.

Front

What is subtraction?

Back

Subtraction is the process of finding the difference between two numbers by taking one number away from another.

Front

What does it mean to add three-digit numbers?

Back

Adding three-digit numbers means combining numbers that have hundreds, tens, and units places.

Front

What does it mean to subtract three-digit numbers?

Back

Subtracting three-digit numbers means taking away a three-digit number from another three-digit number.

Front

What is the sum of 246 and 553?

Back

799

Front

What is the difference when you subtract 529 from 817?

Back

288

Front

If Ian has 4,907 stamps and adds 3,156, how many does he have now?

Back

8,063 stamps

Front

How do you check your addition?

Back

You can check your addition by using subtraction. If the sum plus the number you added equals the original number, it's correct.

Front

What is a three-digit number?

Back

A three-digit number is any number from 100 to 999.

Front

What is the first step in solving a three-digit addition problem?

Back

Line up the numbers by their place values: hundreds, tens, and units.