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Lesson 1: Common fractions and decimals

# Common fractions and decimals

Explores the concept of converting common fractions (1/5, 1/4, 1/2) into decimals. Learn the importance of understanding these conversions for real-life applications and for working with multiples of these fractions.

## Want to join the conversation?

• how do you convert a percentage into a decimal?
• Move the imaginary decimal point two spaces to the left.
100% -> 1.00
50% -> 0.50
1% -> 0.01
You could also divide a percentage by 100 to get the decimal.
100%/100 is 1.00
50%/100 is 0.50
1%/100 is 0.01
• I tipped in 1/4 = 25/100 but it’s says it’s wrong why is that
• that is true but they are asking you to rewrite it as a decimal. 1/4 = .25
• I don't get how a fraction can be converted into a decimal.
• The simplest method to transform a fraction number to a decimal value is to simply divide the numerator by the denominator to get the decimal value. The numerator is the top number and the denominator is the bottom.
• can you times a decimal
• Yes. If you want to multiply a decimal, you have to just multiply the numbers, and put the decimal point in after. For example, 4 times 0.2 is 0.8.
• I can understand converting fractions to decimals but not decimals to fractions :(
• Converting decimals to fractions is actually easier. It's all in how you SAY the decimal. For example:

0.2 is pronounced two tenths and then is written 2/10
0.35 is pronounced thirty five hundredths an then is written 35/100

Get the idea?
• The cursor in this video is too big for learners to see what you are writing. Maybe make it smaller?
• I don't understand the 0.75 Question
• Another way of converting 0.75 to a fraction is to start by writing it as 75/100. Then you notice that both the numerator and denominator are divisible by 25, so you end up with 3/4.
• is there any way to practice problems that come up how he understood what if 4 doesn't go into 10 but then was like 4 does go into 100 . because i wouldnt have been able to realize that 4 goes into 100 so easy without figuring it out by actually trying to see if it does
• So what you do is 10/4 = 2.5 right but if you do 100/4 it equals 25 so just take away the decimal point
• David because he is funny and he says David out.
• how do you subtract a decimal with a fraction?
• Convert either one to another format.

For example 12.3 - 45 / 6

Let's convert 45 / 6 to a decimal
12.3 - 7.5
= 4.8

Let's convert 12.3 to a fraction
123 / 10 - 45 / 6
= (123 * 6 - 45 * 10) / (10 * 6)
= 288 / 60
= 24 / 5