Boey Wai Yen
Asked 7 years ago

SG chevron_right chevron_right

Thank you for accepting me as member. :)

Replies 0

Lee Yuet Meng
Asked 7 years ago

SG chevron_right Primary 5 chevron_right Fractions

And this one too. Challenging indeed (to me)!

Replies 4

Emma Valerio

Working backwards again, through each step.

4 years ago
Emma Valerio

You could use bar modeling along the way to find the quantities that were transferred.

4 years ago
Alice Lieu

4 years ago
Adrian Ng

Making it visual...

4 years ago

Lee Yuet Meng
Asked 7 years ago

SG chevron_right Primary 4 chevron_right Fractions

Can someone help? TIA!

Replies 4

Emma Valerio

I worked through it backwards, starting with each boy having 360.

4 years ago
Lee Yuet Meng

Thanks!

4 years ago
Emma Valerio

No problem, I really enjoy these problems!

4 years ago
Adrian Ng

Making it visual...

4 years ago

Adeline Chan
Asked 7 years ago

SG chevron_right chevron_right

Thank you

Replies 0

Sherleen Ee
Asked 7 years ago

SG chevron_right Primary 3 chevron_right Fractions

May I know how to show working for a P5 student? Thanks

Replies 21

Kai Meng

The average is between the two fractions.

4 years ago
Sherleen Ee

Taking average is 9/20, not the ans for this qn as denominator must b lesser than 20.

4 years ago
Kai Meng

It says not greater than 20, doesn't mean less than 20.

4 years ago
Kai Meng

20 is not greater than 20.

4 years ago
Emma Valerio

4 years ago
Eugene Ng Ming Teck

This question is not about average. It is about equivalent fractions. You want a fraction bigger than 2/5 but smaller than 1/2. But you cannot compare the fractions until the denominators are the same.

4 years ago
Eugene Ng Ming Teck

Emma has solved it well. Thank you

4 years ago
Kai Meng

The average of two numbers is always between them.

4 years ago
Eugene Ng Ming Teck

Thanks Kai Meng, that is true indeed. What I intended to explain was in the context of a P5 student. And not to layer 2 different concepts together. But it would be good to extend this for pupils who have a good grasp of math.

4 years ago
Kai Meng

I'm for integrating concepts, as I find that many students see the topics as separate and that limits their understanding and problem solving skills in some ways. Anyway there are always multiple ways to answer a question.

4 years ago
Sherleen Ee

ok.... got it.... thanks alot

4 years ago
Sherleen Ee

But what if the qn want a denominator lesser than 20?

4 years ago
Kai Meng

Then that's impossible because 9/20 is already at its simplest form.

4 years ago
Sherleen Ee

I roughly work out... I thought 3/7 is psb? (if qn wants denominator less than 20)

4 years ago
Kai Meng

3/7 can be an answer if "between" doesn't mean right in the middle between those two given fractions.

4 years ago
Emma Valerio

There would be other options, if the answers could be given as decimals: 0.41, 0.42...0.49

4 years ago
Emma Valerio

3/7 does answer the original question. It does not say the answer has to be right in the middle. Neither does it say that there is only one answer. How did you find 3/7 and how would you explain that to a child?

4 years ago
Sherleen Ee

Thanks alot for your explanation, appreciate it much :)

4 years ago
Kho Tek Hong

Many possible answers: 3/7, 4/9, 5/11, 5/12, 6/13, etc. get students to justify their answers.

4 years ago
Rika Gerryts

Or 5/12

4 years ago
Darryl Seah

Key question to the child: "Why did you choose this fraction?"

4 years ago