Adrian Ng
Asked 9 years ago

SG chevron_right Primary 5 chevron_right Number and Algebra

Making it visual...

Replies 1

Lkc Lim

Thanks!

6 years ago

Candy Loh
Asked 9 years ago

SG chevron_right Primary 5 chevron_right Number and Algebra

Pls help again! Thanks40% of Cindy's money is 80% of Rachel's money. If Rachel has $100, how much money does Cindy have?

Replies 4

Shaoyang Brandon

Hi, Candy! Refer to the solution below. What challenges did you have with the question? :)

6 years ago
Candy Loh

My kid dun understand the question. Thanks

6 years ago
Jason Oon

1. 40% of Cindy's money is 80% of Rachel's money means that Cindy has more money. 2. 40% Cindy -> 80% Rachel 10% Cindy -> 20% Rachel 100% Cindy -> 200% Rachel $100 x 2 = $200

6 years ago
BA Poh Ann

Suggestion: Change % to fraction, 40% = 2/5 (C) 80% = 4/5 (R) Since 40% of C = 80% of R, 2/5 (C) = 4/5 (R) Find the common multiple of their numerators: 4/10 (C) = 4/5 (R) Denominators represent their units, Cindy = 10 units, Rachel = 5 units 5 units = $100 10 units = 2 x $100 = $200 (Ans)

6 years ago

Lkc Lim
Asked 9 years ago

SG chevron_right Primary 5 chevron_right Number and Algebra

Can anyone help? Thanks!

Replies 2

Yeo See Yeong

3 double seats for 180 mins. technically can house 6*180 = 1080 people (each for 1 min). since each person rowed 135min, there are 1080/135 = 8 people.

6 years ago
Lkc Lim

Thanks but explain this way my niece will be blur lol

6 years ago

Candy Loh
Asked 9 years ago

SG chevron_right Primary 5 chevron_right Number and Algebra

P5 question. Pls help. Thanks in advance.

Replies 1

Yeo See Yeong

20% = 360. Therefore, 100% = 360*5 = 1800.

6 years ago

Josephine Koh
Asked 9 years ago

SG chevron_right Primary 5 chevron_right Fractions

P5 question please help. Thanks!!

Replies 9

Shaoyang Brandon

Hi. Here is the solution. What challenges did you have with the question? :)

6 years ago
Josephine Koh

Find that this is a difficult Qn.😀 why for x we need to add 6 and 5? And why zizi part is 5+1=6? Thanks?

6 years ago
Shaoyang Brandon

No need to add 5 and 6 for Xavier. The numbers are the differences for the various comparisons of the 3 of them. For Zizi, because Yathi gave away one unit to Xavier, Yathi has 6 units instead of 5 units lesser than Zizi. The difficult part is to partition the big units into smaller units. :) Partitioning, for me, is always more challenging because you have to fit in the information seamlessly. Do you also have this challenge too? :)

6 years ago
Josephine Koh

Thanks. But still can't get that 1 unit is $14. How about the 25? Do we need to use that? Thanks!

6 years ago
Shaoyang Brandon

Do you see the dark blue lines that extend slightly out of the model? That was the initial size of the unit when I saw that X was 3/5 of Y. So, it was 3 BIG UNITS FOR X, 5 BIG UNITS FOR Y. :) Then, because Y is 3/4 of Z, I had to find a way to change THE 5 BIG UNITS OF Y INTO MULTIPLES OF 3 SO THAT Y IS 3/4 OF Z. Thus, I cut the BIG UNIT marked by the thick blue lines INTO 3 SMALLER UNITS. Y is now 3/4 of Z. Then, I observed that X HAS 9 UNITS AND Y HAS 15 UNITS. If I moved 1 UNIT FROM Y TO X, then, X HAS 9+1 = 10 UNITS AND Y HAS 15-1=14 UNITS. X is now 10/14 (or 5/7) of Y. That was how I know that the 1 smaller unit is $14. :)

6 years ago
Shaoyang Brandon

I suddenly realised I made an error. It should be $25, not $14. Sorry for the error. Otherwise, everything else is in place. :)

6 years ago
Josephine Koh

Thank you for your solution!!😀

6 years ago
Yeo See Yeong

6 years ago
Josephine Koh

Thank you for the solution!!😀

6 years ago
Josephine Koh

Thanks. But still can't get that 1 unit is $14. How about the 25? Do we need to use that? Thanks!

6 years ago
Shaoyang Brandon

Do you see the dark blue lines that extend slightly out of the model? That was the initial size of the unit when I saw that X was 3/5 of Y. So, it was 3 BIG UNITS FOR X, 5 BIG UNITS FOR Y. :) Then, because Y is 3/4 of Z, I had to find a way to change THE 5 BIG UNITS OF Y INTO MULTIPLES OF 3 SO THAT Y IS 3/4 OF Z. Thus, I cut the BIG UNIT marked by the thick blue lines INTO 3 SMALLER UNITS. Y is now 3/4 of Z. Then, I observed that X HAS 9 UNITS AND Y HAS 15 UNITS. If I moved 1 UNIT FROM Y TO X, then, X HAS 9+1 = 10 UNITS AND Y HAS 15-1=14 UNITS. X is now 10/14 (or 5/7) of Y. That was how I know that the 1 smaller unit is $14. :)

6 years ago
Shaoyang Brandon

I suddenly realised I made an error. It should be $25, not $14. Sorry for the error. Otherwise, everything else is in place. :)

6 years ago
Josephine Koh

Thank you for the solution!!😀

6 years ago
Josephine Koh

Thank you for your solution!!😀

6 years ago