How do you subtract counting up?

Subtracting by counting up involves starting with the smaller number in the subtraction problem and counting upwards until you reach the larger number. The number of "hops" or counts it takes to reach the larger number is the answer to the subtraction problem.

Explanation

Instead of taking away, you find the difference by determining how much you need to add to the smaller number to equal the larger number. This method is particularly useful for smaller numbers and can be visualized using a number line or even your fingers.

Example

Let's consider the problem: 7 - 5 = ?

1. Start at the smaller number: Begin with 5.
2. Count up to the larger number: Count from 5 to 7: "6, 7".
3. Determine the number of counts: It took two counts (or hops) to get from 5 to 7.
4. The answer: Therefore, 7 - 5 = 2.

Using a Number Line

You can visualize this on a number line.

1. Locate 5 on the number line.
2. Count the spaces until you reach 7.
3. You'll see that you moved two spaces.

Benefits of Counting Up

• Intuitive: It builds on the concept of addition.
• Visual: Easy to visualize with fingers or a number line.
• Helpful for Mental Math: Works well with smaller numbers, making mental calculations quicker.