Mental Division: 2 Digit by 1 Digit Numbers

We have learned how to multiply 2-digit by 1-digit numbers mentally and in this post, we are going to discuss its corresponding method in division. Division seems to be the most difficult operation in mental calculation, but with the right strategy, it can be done. In the discussion, we will start with easy examples and […]

Cool Multiplication Trick Part 1

We have learned quite a number of multiplication tricks now and in this post, I am going to teach you another multiplication trick which you can use to calculate faster and share with your friends. This multiplication trick is quite similar to squaring a number ending in 5. The conditions to perform this trick are […]

Why the Addition of Dissimilar Fractions Trick Works

In the pervious post, we have learned a math trick on addition of two dissimilar fraction. This is done by “cross multiplying” the numerators and denominators of the fractions as shown below (read the previous post for more details). In this post, we discuss why this trick works. Remember: It’s cool to know the math trick, but it’s […]

add fractions faster

How to Add Two Fractions Faster

Fractions whose denominators are the same are called similar fractions, otherwise they are called dissimilar fractions. The fractions 1/9 and 7/9 are similar fractions, while 3/4 and 2/3. Adding similar fractions is easy. Just copy add the numerator and then copy the denominator. For example, 1/9 + 7/9 = 8/9. Adding dissimilar fractions is a bit […]