SOS mum:

Hi, ps help. Many tks and God Bless:)


In a swimming club, the ratio of the number of girls to the number of boys was 5:3. After 3 girls and 5 boys joined the club, the ratio became 7:5. How many girls were there in the club at first?

Hi SOS mum

Good Morning.

I've managed to find another old similar solution, hope you'll find it useful.

Once students become more familiar, they may just consolidate the information into one table.

Best wishes.

http://farm9.staticflickr.com/8529/8620820852_764a0a8167_z.jpg\">

SOS mum:

Hi, ps help. Many tks and God Bless:)


In a swimming club, the ratio of the number of girls to the number of boys was 5:3. After 3 girls and 5 boys joined the club, the ratio became 7:5. How many girls were there in the club at first?

Hi SOS mum

Good Morning.

You may wish to take a look a solution for a similar question.

Hope this helps.

Best wishes.

http://farm9.staticflickr.com/8123/8623762569_1630de421c_z.jpg\">

chloecube:

Hi Tianzhu! so nice to see you again

thks for the help all these years

thank you and wishing you a very Happy Lunar New Year

Hi chloecube

Good Morning.

You're welcome.

Good Health, and a Happy Chinese New Year.

Best Wishes

ozora:

need some guide.

Mary had some beads. 2/5 of her beads were black and 1/10 of her beads were blue.
the remaining beads were red.
Mary used all her red beads to decorate some purse. The number of red beads used for each purse was 1/8 of the total number of beads. How many purses were decorated/
thanks

Hi ozora

Good Morning.

Please check your source for the last sentence.

For this question, use a common multiple of 40u (5, 10 and 8).

2/5 of her beads were black ----- 16u

1/10 of her beads were blue ----- 4u

The remaining beads were red ----- 20u

The number of red beads used for each purse was 1/8 of the total number of beads. ----- 5u

I am taking the question as number of purses decorated with red beads.

Number of purses decorated with red beads ----- 20/5 ----- 4.

The slide is meant to be a guide, I'll leave it to your kid to fill out the details.

Besides MD, you may also use solve this question using fractions.

1 – 2/5 -1/10 ----- 1/2

1/2 /1/8 ----- 4 (number of purses decorated with red beads )

Hope this helps.

Best wishes

https://farm2.staticflickr.com/1551/24415935109_5ab16c761a_z_d.jpg\">

chloecube:

need help on this.


I didn't have the question with me now, but the question is roughly like that

84 scouts are going on a camping trip. the food they have are enough to last the 84 scouts for 12 days
on the camping day, 21 scouts did not turn up, assuming that each scout take the same amount of food. how many days can the food last the remaining scouts

TIA!

Hi chloecube

Good Morning

In this scenario, we are talking about inverse proportion which means when one quantity increases, the other quantity decreases .When one quantity decreases, the other increases.

For this question, when number of scouts increases, then quantity of food decreases .When number of scouts decreases, then quantity of food increases.

Amount of food ----- 84*12 (based on 84 scouts for 12 days)

21 scouts did not turn up, so we have 63 scouts.

Now, we are expecting the original amount of food to last longer due to the reduced number of scouts.

Number of days the food can last ----- (84*12)/63 ----- 16

Hope this helps.

Best wishes

doraemo:

hi , please help :


Maggie had some money at first . She spent t all in 3 stores. In each store, she spent $2 more than half of what she had when she entered.
a) How much did she spend at the last store?
b) How much did she have at first?

Hi doraemo

Good Afternoon.

I'll just provide some guideline and leave it to your kid to work out the details. Use \"Working Backwards\"

\"She spent all of her money in 3 stores.\" in place of \"She spent t all in 3 stores.\"

Hope this helps.

Best wishes

https://farm2.staticflickr.com/1648/24378522409_13d3f66f7f_z_d.jpg\">

YellowRabbit:

Hi All,


Would appreciate if you can help with the below question:


Sally has $8 more than Sam. If their mother gives them $7 each, they will have $32 altogether. How much does Sally have at first?

Thanks!!!

Hi YellowRabbit

Good Evening.

Hope this helps.

Best wishes

https://farm2.staticflickr.com/1684/24665227755_4c543caf4e_z_d.jpg\">

mumof8:

Hi again!!


Can anyone help me with this question? A big thank you!!

Lisa and Patsy had an equal number of cookies at first. Lisa ate 9 of her cookies
and Patsy bought another 21 cookies. Patsy now has thrice as many cookies as Lisa.
How many cookies did Lisa have at first?

Hi mumof8

Good afternoon

Hope this helps.

https://farm2.staticflickr.com/1638/24528054956_05fd8e75d8_z_d.jpg\">

Best wishes

angel:

Can you explain using model examples? I do not understand your workings. Thanks a lot.

Hi angel

Good Morning.

Here’s a slide for a similar question discussed earlier in the forum.

Mrs Toh bought some chocolates to distribute to her class. If each child gets 2 chocolates, she would be left with 40 chocolates. If each child gets 4 chocolates, she would need 30 more chocolates.
a) How many children are there in her class
b) How many chocolates did Mrs. Toh have at first.

When students are able to understand the logic behind the solution, MD might not be necessary.

Hope this helps.

Best wishes

http://farm6.staticflickr.com/5346/8787021811_022a432b64_z.jpg\">

tanxexy:

Please help on this question from ACS P5 2014 SA2:


http://i57.tinypic.com/zwe33r.png\">

Hi tanxexy

Good Afternoon

I suggest you get hold of a piece of paper and fold according to picture (no need to be same as dimensions).

This is to get your kid to understand the concept of folded areas or angles.

For this question, imagine you unfold the triangles at the left and right sides to form a square piece of paper of 12cm by 12cm.

Shade the original triangles with colours if you want to.

On the lower side of the square, you’ll see three equal sides of 4cm (12/3).

12 – 5 ----- 7

Area of 1 triangle ----- ½*4*7

Area of 4 triangles ----- ½*4*7*4 ----- 56

Area of square ----- 12*12 ----- 144

Area of shaded parts ----- 144 – 56 ----- 88

Hope this helps.

Best wishes