You frequently work with decimals when dealing with money, metric measurements, and food sold by the pound. The following problem requires you to add and subtract decimals. Even though the decimals may [more…]
Many real-life problems involve adding and subtracting percents. For example, percents can represent answers in polls, votes in an election, or portions of a budget, and the total often has to add up to [more…]
The word of in a word problem usually means multiplication. This idea is also true in word problems involving decimals and percents. The method for solving these two types of problems is similar, as you’ll [more…]
If you need to calculate someone’s salary increaseor raise based on the percentage of the raise, you can do this using the distributive property. Here’s an example: [more…]
When you receive interest from the bank, you get more money. And when you earn interest on the interest you earned earlier, this makes the dollar amounts grow even faster. Here’s an example: [more…]
You can use subtraction to calculate a percentage discount. In fact, when you hear the words discount or sale price, you should automatically think of subtraction. Here’s an example: [more…]
Probability is the mathematics of deciding how likely an event is to occur. It has a wide variety of applications in insurance, weather prediction, biological sciences, and even physics. For example, [more…]
To work with sets, you need to understand terms such as elements and cardinality. You also need to know how to recognize equal sets, subsets, and empty sets, and how they relate to each other. [more…]
Set theory has four important operations: union, intersection, relative complement, and complement. These operations let you compare sets to determine how they relate to each other. [more…]
Quantitative data assigns a numerical value to each member of a statistical sample. You can use this information to find the mean and median values.
The following sample — which is purely fictional — uses [more…]
The English system of measurement is most commonly used in the United States (but, ironically, not in England). Although you’re probably familiar with most of the English units of measurement, in the following [more…]
When you want to subtract fractions with different denominators, you have a choice of methods: the easy way, the quick trick, and the traditional way.
The easy way always works, and you should use this [more…]
Word problems help you understand the logic behind setting up equations in real-life situations. The skill you need most when working with word problems is understanding how to turn the situation you’re [more…]