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primary 5 | Maths
| Fractions
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Pls help me to understand why the answer is 3 instead of 2.thank you
Date Posted: 5 years ago
Views: 266
She bought 3/4 kg of sugar and used 1/5 of it
(NOT the same as she bought 3/4 kg of sugar and used 1/5 kg)
1/5 of the 3/4 kg
= 1/5 x 3/4
= 3/20
Mass left
= 3/4 - 3/20
= 15/20 - 3/2
= 12/20
= 3/5
(NOT the same as she bought 3/4 kg of sugar and used 1/5 kg)
1/5 of the 3/4 kg
= 1/5 x 3/4
= 3/20
Mass left
= 3/4 - 3/20
= 15/20 - 3/2
= 12/20
= 3/5
Had it been
She bought 3/4 kg sugar and used 1/5 kg of sugar
Then the mass left
= 3/4 - 1/5
= 15/20 - 4/20
= 11/20
The phrase “1/5 of it” versus “1/5 kg” are completely different.
She bought 3/4 kg sugar and used 1/5 kg of sugar
Then the mass left
= 3/4 - 1/5
= 15/20 - 4/20
= 11/20
The phrase “1/5 of it” versus “1/5 kg” are completely different.
Thank you for your explanation, but I still don't get it what is the different between of and of it?
Can you Pls explain more .thank you
Can you Pls explain more .thank you
1/5 of it means 1/5 out of the 3/4 kg
This means that we split the 3/4 kg into 5 equal parts. If we express 3/4 kg as 15/20 kg, we can split this into 5 equal parts of 3/20 kg each.
This is different from the other case in which you are just subtracting kg against another kg.
This means that we split the 3/4 kg into 5 equal parts. If we express 3/4 kg as 15/20 kg, we can split this into 5 equal parts of 3/20 kg each.
This is different from the other case in which you are just subtracting kg against another kg.
The difference lies in the word kg.
“1/5 of it” and “1/5 kg of it”.
These are not the same.
“1/5 of it” and “1/5 kg of it”.
These are not the same.
Understand now.thank you very much.
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hope it helps
Date Posted:
5 years ago
Thank you
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