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Course: Arithmetic>Unit 11

Lesson 1: Decimal fractions

Writing a number as a fraction and decimal

Sal shows the connection between decimals and fractions using a grid diagram and number lines.

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• any tips when my 10 yo daughter keeps writing 1/2 as 0.12 instead of 0.5? She is usually a quick learner but is struggling with simple fractions
• Well,@Adele Canny, you could teach your daughter to remember by conceiving that 1/2 means 0.5 as 2 slashes 1 and cuts it in half and thus leaving 0.5 in each side and when these two join up, they make a 1. 1/4 4 slices 1 into 4 parts and they are 0.25 and when the combine the make 1

If your daughter is a quick learner then I suggest that she should what sal khans videos again and again until she catches on.
• What if the blue dot is before 1/10 and after zero what’s the answer
• you would have to make it into 100ths. If it were before 1/100 and zero you would add a zero to make it 1000ths and so on.
• How do you make 1,999/2,000 a decimal?
• Umm… I'm not so sure. But I think it’s, 0.1999
• What is .76 as a fraction
• It is 76/100
• Why each hashmark represent a hundred?
• Each hash mark represents a hundredth (1/100) on this line, just because that's the way it is. You can figure this out because there's 10 evenly spaced hash marks from 0 to 1/10, so to get the increment of each hash mark, you divide 1/10 by 10, getting a length of 1/100 for each hash mark.
It's only 1/100 for this number line. You can make number lines with whatever scale you want to, to best help you solve the problem.
• Express the location of the point on the number line was confusing. Why counting by hundredths? What video can I see to review this concept further?
• well for example 0.2 the 2 at the end is 10ths soo...
0.20 is 100ths and so on and on
• my question why do decimals end up with zero somtimes
• How can I make 16/24 as a decimal
• 0.66666666666... and goes on forever
• Can someone help I didn't get it at 1 min 35 sec
• How are decimals related to fractions?