Multiplication Calculator (2024)

Welcome to Omni's multiplication calculator, where we'll study one of the four basic arithmetic operations: multiplication. In short, we use it whenever we want to add the same number several times. For instance, 161616 times 777 (written 16×716 \times 716×7) is the same as adding 161616 seven times, or, equivalently, adding 777 sixteen times. Conveniently, our tool works also as a multiplying decimals calculator. What is more, even if you have more than two numbers to multiply, you can still find their product with this calculator.

Note: If you'd like to see step-by-step solutions to multiplying large numbers, check out Omni's long multiplication calculator or partial products calculator.

Let's waste not a second more and see how to multiply numbers!

How do I multiply numbers?

Product and multiplication refer to the same thing: the result from multiplying numbers (or other objects, for that matter). Fortunately, the process is very simple: it boils down to adding the value a suitable number of times. For instance, 242424 times 555 means that we add 242424 five times, i.e.:

24×5=24+24+24+24+24=120\begin{split}24& \times 5 \\&= 24 + 24 + 24 + 24 + 24 \\&= 120\end{split}24×5=24+24+24+24+24=120

Similarly, 121212 times 202020 translates to adding 121212 twenty times:

12+12+12+12+12+12+12+12+12+12+12+12+12+12+12+12+12+12+12+12=240\begin{split}12 &+ 12 + 12 + 12 + 12 + 12 \\&+ 12 + 12 + 12 + 12 + 12 \\&+ 12+ 12 + 12 + 12 + 12 \\&+ 12 + 12 + 12 + 12 = 240\end{split}12+12+12+12+12+12+12+12+12+12+12+12+12+12+12+12+12+12+12+12=240

However, note that we can always invert the process of finding the product with multiplication. In other words, the 242424 times 555 can also mean adding 555 twenty-four times:

5+5+5+5+5+5+5+5+5+5+5+5+5+5+5+5+5+5+5+5+5+5+5+5=120\begin{split}5& + 5 + 5 + 5 + 5 + 5 + 5 \\&+ 5 + 5 + 5 + 5 + 5 + 5 \\&+ 5 + 5 + 5 + 5 + 5 + 5 \\&+ 5 + 5 + 5 + 5 + 5 = 120\end{split}5+5+5+5+5+5+5+5+5+5+5+5+5+5+5+5+5+5+5+5+5+5+5+5=120

and we can get 121212 times 202020 by adding 202020 twelve times:

20+20+20+20+20+20+20+20+20+20+20+20=240\begin{split}20 &+ 20 + 20 + 20 + 20 + 20\\ &+ 20 + 20 + 20 + 20 + 20 \\&+ 20 = 240\end{split}20+20+20+20+20+20+20+20+20+20+20+20=240

It's always our choice how to multiply the numbers since the result is the same either way. In mathematical terms, this means that the product or multiplication is a commutative operation. Note that the same is true for addition. On the other hand, it does not hold for, say, subtraction.

🔎 Do you know that there are more ways to write arithmetic operations than the "classic" operator in the middle one? Try them out with our Polish notation converter!

Also, our multiply calculator only deals with numbers, but mathematicians figured out how to multiply other objects. Below we list a few other multiplication calculators from Omni.

  • Matrix multiplication calculator;
  • Multiplying fractions calculator; and
  • Multiplying radicals calculator.

However, it's not always that we deal with integers like 222, 181818, or 202020202020. We've learned how to multiply those and what, say, 161616 times 777 is, but how do we find the product of decimals? For example, what is 0.20.20.2 times 1.251.251.25? Is our multiplication calculator also a multiplying decimals calculator?

Oh, you bet!

Multiplying decimals

In essence, decimals are fractions. Therefore, one way of multiplying decimals is to convert them to regular fractions and then use the basic rule of numerator times numerator over denominator times denominator. For example,

0.2×1.25=210×125100=2×12510×100=2501000=0.25\begin{split}0.2\times1.25 &= \frac{2}{10}\times \frac{125}{100} \\[1em]&= \frac{2 \times 125}{10\times 100} \\[1em]&=\frac{250}{1000} = 0.25\end{split}0.2×1.25=102×100125=10×1002×125=1000250=0.25

Of course, we could have also found easier equivalent fractions to the two given before multiplying. In this case, we could have said that 0.2=1/50.2 = 1/50.2=1/5 and 1.25=5/41.25 = 5/41.25=5/4, so

0.2×1.25=15×54=1×55×4=520=14\begin{split}0.2 \times 1.25 &=\frac 1 5 \times \frac 5 4 \\[1em]&= \frac{1\times 5}{5\times 4}\\[1em]&= \frac{5}{20} = \frac 1 4\end{split}0.2×1.25=51×45=5×41×5=205=41

Both answers are correct; it's always your choice how to multiply decimals. However, besides the two mentioned, there is another.

Multiplication Calculator (1)

When multiplying decimals, say, 0.20.20.2 and 1.251.251.25, we can begin by forgetting the dots. That means that to find 0.2×1.250.2 \times 1.250.2×1.25, we start by finding 2×1252 \times 1252×125, which is 250250250. Then we count how many digits to the right of the dots we had in total in the numbers we started with (in this case, it's three: one in 0.20.20.2 and two in 1.251.251.25). We then write the dot that many digits from the right in what we obtained. For us, this translates to putting the dot to the left of 222, which gives 0.250=0.250.250 = 0.250.250=0.25 (we write 000 if we have no number in front of the dot).

All in all, we've seen how to multiply decimals in three ways. To be perfectly honest, the first two were pretty much the same thing; it's just that the intermediate steps were in a different order. Nevertheless, this concludes the part about how to multiply without a calculator. Now let's describe in detail how to do it with one, and to be precise, with Omni's multiplication calculator.

Example: using the multiplication calculator

Let's find 202020202020 times 121212 with the multiply calculator. At the top of our tool, we see the formula:

Result=a1×a2\mathrm{Result} = a_1\times a_2Result=a1×a2

This means that to calculate 2020×122020 \times 122020×12, we need to input:

a1=2020a_1 = 2020a1=2020

And:

a2=12a_2 = 12a2=12

The moment we give the second number, the multiplication calculator spits out the answer in the Result field.

Result=2020×12=24240\mathrm{Result} = 2020\times 12=24240Result=2020×12=24240

However, say that you'd like to multiply the result further by 1.31.31.3 (remember that our tool also works as a multiplying decimals calculator).

We could just clear out the fields and write the answer from above into one of the factors, i.e., input a1=24240a_1 = 24240a1=24240 and a2=1.3a_2 = 1.3a2=1.3. Alternatively, we can simply select many numbers under Multiply..., which lets us find the product of multiplication for more numbers. If we do so, we'll get the option to input a1a_1a1, a2a_2a2, a3a_3a3 and so on up to a10a_{10}a10 (note how initially only a1a_1a1 and a2a_2a2 are there, but more variables appear once you start filling the fields). It's then enough to input:

a1=2020a2=12a3=1.3\begin{split}a_1&=2020\\a_2&=12\\a_3&=1.3\end{split}a1a2a3=2020=12=1.3

And read off the answer from underneath:

Result=2020×12×1.3=31512\begin{split}\mathrm{Result} &= 2020\times 12 \times 1.3 \\&= 31512\end{split}Result=2020×12×1.3=31512

Well, this multiply calculator sure saves a lot of time. Can you imagine writing two thousand twenty times the number 121212 like we did in the first section? We, for one, don't.

FAQ

Is product same as multiplication?

Multiplication is one of four basic arithmetic operations (the three others are addition, subtraction, and division).

Product is the result of carrying out multiplication: when we multiply two numbers (multiplicand and multiplier), we obtain their product.

What are the parts of multiplication?

The two numbers we multiply together are called multiplicands and multipliers or just factors. The result of the multiplication is called the product. For instance, in the multiplication problem 3 × 5 = 15, the number 3 is the multiplicand, 5 is the multiplier, both 3 and 5 are the factors, and 15 is the product.

What are the properties of multiplication?

The arithmetic operation of multiplication of two numbers is:

  • Associative;
  • Distributive; and
  • Commutative.

What is the neutral element of multiplication?

The neutral element (a.k.a. identity element) of multiplication is the number 1. This means that 1 is the (unique) number such that when we multiply any number by 1 then we obtain the same number we started with.

How do I multiply by 100?

To multiply any number by 100, follow these steps:

  1. If your number is an integer, write two additional zeros at the right end of your number.
  2. If your number has a decimal point, you'll need to move the decimal point two places to the right. Add one or two trailing zeros if there are less than two decimal digits.
Multiplication Calculator (2024)

FAQs

What is the long multiplication method with decimals? ›

Long Multiplication with Decimals

Count the total number of decimal places contained in both the multiplicand and the multiplier. Multiply the numbers using long multiplication. Insert a decimal point in the product so it has the same number of decimal places equal to the total from step 1.

What is the standard multiplication algorithm? ›

To solve the standard multiplication algorithm, each digit in one number needs to be multiplied by each digit in the other number. Those products are then added together to find the overall product of the two given numbers.

What is the formula to multiply? ›

Multiplying numbers in Excel

Type an equal sign and then the two numbers you want to multiple, so =2*4. (The asterisk between the two numbers is the Excel multiply symbol.) All screenshots were captured by the author on Microsoft Excel 365 on macOS 14.1, 2023.

How to multiply 2 100 times? ›

The power notation (2100) is a shorthand for this process. So, 2100 just means "2 multiplied by itself 100 times." So, 2 to the power of 100 equals 1,267,650,600,228,229,401,496,703,205,376.

How can I memorize multiplication easily? ›

Easy ways to remember multiplication tables
  1. Write a multiplication table. ...
  2. Recite the multiplication table forwards and backwards. ...
  3. Practice skip-counting. ...
  4. Get your child to set themselves goals and reward them when they meet them. ...
  5. Make it fun!

How do you multiply fractions? ›

You multiply the numerators (the top numbers) together, and then multiply the denominators (the bottom numbers) together. After putting the two results together as a new fraction, you may need to simplify the fraction in order to express it in its lowest terms.

What is the traditional method of multiplication? ›

The long multiplication method, or traditional algorithm, works because of the distributive property. Each place value of the second factor is multiplied by the first factor. Then the products are added together to get a total product.

What is the fastest multiplication algorithm? ›

The Karatsuba algorithm is a fast multiplication algorithm that uses a divide and conquer approach to multiply two numbers.

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