Math Shortcut: Squaring Numbers from 30 to 50

In the previous post, we have learned an interesting math shortcut on squaring numbers from 50 to 70. Before we explain why the shortcut works, we first continue this series by learning a shortcut on squaring numbers from 30 to 50. Notice that the steps are almost similar. Example 1: 472 Step 1: First, consider how […]

Squaring Numbers From 80 To 100

In the previous post, we have learned how to square 2-digit numbers mentally. In this post, we learn specifically another strategy on how to square numbers from 80 to 100. Steps in Squaring Numbers From 80 to 100 Step 1: Subtract the number from 100. Step 2: Square the difference. Step 3: Subtract the result […]

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 […]

Mental Math: How to Subtract Numbers Faster

In the previous post, we have learned a faster way to add numbers near multiples of 10. In this post, we are going to learn to subtract numbers faster, but first let’s review some basic terms. In the subtraction 8 – 6 = 2 8 is the minuend, 6 is the subtrahend and 2 is the […]