Unit 4: More Adding and Subtracting with Two-Digit 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 taking one number away from another.

Front

What is a two-digit number?

Back

A two-digit number is a number that has two places, such as 10 to 99.

Front

How do you add two-digit numbers?

Back

To add two-digit numbers, align the numbers by place value and add each column, starting from the right.

Front

How do you subtract two-digit numbers?

Back

To subtract two-digit numbers, align the numbers by place value and subtract each column, starting from the right.

Front

What is a number sentence?

Back

A number sentence is a mathematical statement that shows a relationship between numbers using operations like addition or subtraction.

Front

What does it mean to find the total?

Back

Finding the total means calculating the sum of all the numbers involved.

Front

What is a word problem?

Back

A word problem is a math problem written in the form of a story or real-life situation.

Front

How can you check your addition?

Back

You can check your addition by using subtraction to see if the sum matches the original numbers.

Front

How can you check your subtraction?

Back

You can check your subtraction by adding the difference to the smaller number to see if it equals the larger number.