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Multiples of 21
Methods
Methods for Finding Multiples: from a Math Tutor
For a beginner, a math tutor suggests that you can find the multiples of a number by skip-counting to the next number. For Instance, if you want to find the multiples of 21, you could start at 21, and keep adding 21 over and over: 21, 42, 63, 84, and so on. Each of these numbers is a multiple of 21. Typically, this works best only for smaller numbers, as adding larger numbers together over and over can be difficult.
Another way to do this is to use multiplication. To find the first few multiples of 21, you could just multiply 21 by each number in sequence, first multiplying by 1, then 2, then 3, and so on, which we will outline below.
What are the Multiples of 21?
So, what are the multiples of 21? Let’s write it out using the multiplication method:
Interesting Facts Shared by a Math Tutor about Multiples
• Every number is considered the smallest multiple of itself.
• A multiple of a number is very often also the multiple of another number. This is because if you multiply two numbers together, the result is a multiple of both numbers.
• All multiples of even numbers are even.
• The multiples of odd numbers, in sequence, alternate between odd and even numbers.
• You can also find the negative multiples of a number by multiplying by negative numbers.
Math Tutor Suggests Exploring: Practice Finding Multiples of Other Numbers
Finding multiples of any number can be done using the same methods as outlined above. You can see how this can be done with specific numbers, like the ones below, by clicking on the any of the links below:
Multiples of 372 - The first five multiples of 372 are 372, 744, 1116, 1488, 1860
Multiples of 748 - The first five multiples of 748 are 748, 1496, 2244, 2992, 3740
Multiples of 628 - The first five multiples of 628 are 628, 1256, 1884, 2512, 3140
Multiples of 681 - The first five multiples of 681 are 681, 1362, 2043, 2724, 3405
Multiples of 670 - The first five multiples of 670 are 670, 1340, 2010, 2680, 3350
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