Multiplying decimals by 10 To multiply by 10, you **move the digits one place value to the left**. So 4.2 x 10 = 42. We don’t have any numbers after the decimal point now so we don’t have to include it!

## How do you multiply fast decimals by 10 or 100 mentally?

Quote from video: *And then point 2 times 10 again we'll just move the decimal point one place that way that's too well we can simplify that 4 divided by 2 is 2. So 4 tenths divided by 2 tens times 10 / 10 is.*

## How do you multiply decimals step by step?

To multiply decimals, **first multiply as if there is no decimal.** **Next, count the number of digits after the decimal in each factor.** **Finally, put the same number of digits behind the decimal in the product**.

## What is the rule for multiplying by 10?

When multiplying whole numbers by 10, simply **add a 0 to the end of the number**. When multiplying decimals by 10, move the decimal point one space to the right.

## How do you multiply and divide decimals by 10?

Quote from video: *Dividing decimals by ten one hundred or one thousand you know that when you multiply a decimal number by ten you move the decimal. Point one place to the right.*

## How do you multiply decimals without a calculator?

Quote from video: *And simply multiply two whole numbers in this case let's start with the four. And do the multiplication. And then we'll come back and insert the decimals accordingly.*

## Why does multiplying by 10 move the decimal to the right?

When you multiply a decimal by a power of 10, simply **move the decimal place to the right as many places as there are 0s in the power of 10**. When you divide a decimal by a power of 10, simply move the decimal place to the left as many places as there are 0s in the power of 10.

## How do you multiply decimals for kids?

Quote from video: *Let's start with 5 times 5 which is 25. But we need to carry the 2 because we can only write one digit. Below. Now we multiply. Five times one and then we add two from above.*

## How can I learn decimals easily?

Quote from video: *You can read this as four point one two or as four and twelve 100's. The decimal number system is based on preceding powers of ten.*

## Why is it important to remember when multiplying decimals?

Multiplying decimals is actually very similar to multiplying whole numbers except you must remember to **account for all the decimals places that are present in the 2 numbers that you are multiplying together**. Let’s work on a example. When multiplying decimal points, do not line up the numbers from the decimal points.

## What happens when you multiply by 10?

When you multiply a number by 10, **the value of each digit becomes ten times bigger**, so each digit moves one place to the left. To multiply a number by 100, move each digit two places to the left.

## Why do you add a zero when multiplying by 10?

**The ‘adding zeros’ trick can work when multiplying whole numbers by powers of 10**, for example, 678 x 10 = 6780, 213 x 100 = 21300, 34 x 1000 = 34000, but this method completely falls down and is totally unsuitable when multiplying a decimal value by a power of 10.

## When dividing a number by 10 Where is the decimal point moved?

the left

When dividing by 10, 100, 1000 and so on, move the decimal point **to the left as many places as there are 0s**. So when dividing by 10, move the decimal point one place, by 100 two places, by 1000 three places and so on. If there is no decimal point in the original number, then imagine it at the end of the number.

## How do you multiply decimals quickly?

Quote from video: *And all you do is look at each square. And multiply the number at the top of the grid by the number on the right hand side so the first box will be 4 times 8 which is 32.*

## How do you multiply decimals 6th grade?

Quote from video: *Places which are jumps in the equation. And we put that many into the product. We have two and three-tenths. Times five-tenths five times three is 15. We regroup.*

## How do you multiply decimals in 5th grade?

Multiplying Decimals by 10, 100, 1000

## How do you mentally multiply a decimal number by 100?

Quote from video: *And all you do is look at each square. And multiply the number at the top of the grid by the number on the right hand side so the first box will be 4 times 8 which is 32.*

## How do you mentally multiply decimals?

Quote from video: *If you know our basic multiplication facts three times four is twelve. And there's two numbers that should be behind the decimal. So we put the decimal place there.*

## How do you multiply decimals with whole numbers mentally?

If you want to multiply a decimal by a whole number, just **ignore the decimal point and multiply like normal**! Then, bring the decimal point back for the answer.

## How do you do decimal in mental math?

Quote from video: *And if I have four people sharing them equally it's like in the picture you've seen 32 pcs. So I'll do in my mind is 32 divided by 4 equals 8 each person would get 8 pieces.*

## What is the easiest way to calculate decimals?

To multiply decimals, just multiply as usual. Then count the total number of digits above the line that are to the right of all decimal points. Place your decimal point in your answer so there are the same number of digits to the right of it as there are above the line.

## How do you do decimals easy?

Quote from video: *Next let's multiply 5 times 3 5 times 3 is 15 plus 4 that's 19 now what we need to do is add the 4 plus 0 is 4 3 plus 5 is 8 2 plus 9 is 11 carry over the 1 1 plus 1 is 2.*