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 does the equal sign (=) mean?

Back

The equal sign means that the values on both sides are the same.

Front

If Joe reads 8 books and Janet reads 3 books, how many books do they read together?

Back

8 + 3 = 11 books.

Front

How do you find out how many more books you need to reach a total?

Back

You subtract the number you have from the total you want.

Front

What is a number sentence?

Back

A number sentence is a mathematical statement that shows a relationship between numbers using operations.

Front

If you have 34 flowers and 18 are left, how many did you put in vases?

Back

34 - 18 = 16 flowers in vases.

Front

What is the purpose of using a number line?

Back

A number line helps visualize addition and subtraction by showing the position of numbers.

Front

If there are 22 deer and 16 are left, how many ran away?

Back

22 - 16 = 6 deer ran away.

Front

What does it mean to 'combine' numbers?

Back

Combining numbers means to add them together to find a total.