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primary 5 | Maths
| Fractions
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Date Posted: 5 years ago
Views: 484
Amount of cloth
= 3/4 * 2/7
= 6/28
= 3/14 m
= 3/4 * 2/7
= 6/28
= 3/14 m
Thank you so much. But what is the theory behind this method?
2/7 is the length of the string. 3/4 means 3 out of 4 parts. So we have to cut 2/7 into 4 parts each.
We make 2/7 become 4/14 because 4 can be divided by 4.
Each part is 1/14 m.
So 3 parts is 3/14 m.
We make 2/7 become 4/14 because 4 can be divided by 4.
Each part is 1/14 m.
So 3 parts is 3/14 m.
A rule of thumb is the word "of" means multiply.
But to understand it, imagine a piece of cloth. Cut it into 4, and take 3.
Therefore 2/7 m, divided by 4, times 3.
Or 2/7 m, times 3, divided by 4. Same thing.
You can write it as 2/7 x 3/4.
But to understand it, imagine a piece of cloth. Cut it into 4, and take 3.
Therefore 2/7 m, divided by 4, times 3.
Or 2/7 m, times 3, divided by 4. Same thing.
You can write it as 2/7 x 3/4.
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