 UPSKILL MATH PLUS

Learn Mathematics through our AI based learning portal with the support of our Academic Experts!

In the previous lesson we learn to perform the addition using the grid models. Now let us take a look how to perform a subtraction using a grid models.
Example:
Find $$0.55 – 0.15$$.

Here, $$0.65$$ can be written as $\frac{55}{100}$, and $$0.15$$ can be written as $\frac{15}{100}$.
• In the grid model first shade the region of $$0.55$$ and cross out the regions $$0.15$$, which means we are excluding $$0.15$$ from the total shaded area.
• The left out shaded regions without the cross marks are the difference between $$0.55$$ and $$0.15$$.
• Therefore, the difference is $$0.55 – 0.15 = 0.40$$ Now let's see word problems to understand this concept clearly.
Example:
Riya's mother gave her $$₹ 5.50$$ and she used this money to buy a pen. If the shopkeeper gave her $$₹ 1$$ what was the pen's rate?

To find the pen's rate, subtract the total amount $$₹ 5.50$$ with the returned amount $$₹ 1$$. That is, $$₹(5.50 – 1) = ₹ 4.50$$. Therefore the cost of the pen is $$₹ 4.50$$.
In the upcoming exercises we practice to solve more problems in this concept.