Getting Started With 4
The number 4 is a natural number that follows 3 and precedes 5.4 4 4 4 It is the smallest square number, the smallest semiprime and composite number, and is considered unlucky in many East Asian cultures.4 It is also the smallest of the first proper pair of twin primes, two and three.
Getting Started with 4
The name "four" comes from the number of letters in the word "four".4 Four is one of the most common numbers used to represent the dollar sign on a computer keyboard, as well as in Internet slang (e.4 4 g. "4u" instead of "for you"), and Leetspeak.4 4
It is the only number whose name in English has the same number of letters as its value.4 In ancient Greek culture, the number 4 symbolized earthly balance.4 4 4
In Pythagorean numerology, the number four is a pseudocience that represents security and stability.4 It is a talisman for astrologers.4
There are several things you can learn about 4:
Identify the arithmetic sequence of this number and find its common difference.4 4 4 4
An arithmetic sequence is a group of numbers that adds or subtracts a fixed amount to get the next term in the sequence.4 This is usually done by subtracting the first term from the second term to determine the common difference.4
Look at the table below to identify the first and last terms of the arithmetic sequence.4 4 When you compare the second and third terms, you will need to decide which group they belong in, based on their differences.4
Reciprocals of Fractions
Each number has a pair of opposites, called the additive inverse and the reciprocal--or multiplicative inverse.4 The simplest way to discover these opposites is by looking at a number line and seeing whether it's on either side of 0.4
Decimal numbers have reciprocals too! To find the reciprocal of a decimal number, simply change it to a fraction and then flip it.4 4
Using a calculator is a great way to work with fractions, but it's also possible to use a piece of paper and pencil to solve problems on your own.4 4 There are a few ways to do this, but the most popular is to multiply each fraction by itself.
There are also ways to simplify a fraction by dividing the numerator and denominator by their greatest common factor, which makes it easier to compute the solution.4
To make a fraction more difficult, you can add or subtract a negative number to the original one.4 4 4 For example, -4 is the opposite of 4.
Multiplying fractions is an important part of mathematics.4 This is because it allows us to calculate the answer to any fraction problem that includes a mixed number of digits.4 It can also be used to multiply large groups of fractions, such as a whole number and its corresponding decimal place.4
During the summer months, you may be able to find mosquitoes in your yard.4 Mosquitoes are an important source of West Nile virus infection, so it's important to protect yourself and your family from them with EPA-approved insect repellent.4 It's also a good idea to wear long-sleeved shirts and pants, treat clothing and gear, and control mosquitoes indoors.4