Add and Subtract on a Number Line (WP)

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

How do you use a number line for addition?

Back

To add using a number line, start at the first number and move to the right by the number you are adding.

Front

How do you use a number line for subtraction?

Back

To subtract using a number line, start at the first number and move to the left by the number you are subtracting.

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 number sentence?

Back

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

Front

If there are 25 students and 19 are left, how do you find the starting number?

Back

You add the number of students that left (25) to the number of students left (19) to find the starting number: 25 + 19 = 44.

Front

What is the total number of tulips and roses if there are 35 flowers?

Back

The total number of tulips and roses is 35, which can be split into different combinations like 14 tulips and 21 roses.

Front

If Larry earned 45 dollars and spent 19 dollars, how much does he have left?

Back

To find out how much Larry has left, subtract the amount spent from the amount earned: 45 - 19 = 26.

Front

How do you find the total number of balloons filled by Logan and Luna?

Back

Add the number of balloons filled by Logan (15 green + 54 yellow) and Luna (22 green + 39 yellow): 15 + 54 + 22 + 39 = 130.