Q&A - P4 Math

[tianzhu]

fohope:

1)Sammy has 7/11 as much money as Jeremy. If they have a total of $198, how much money must Jeremy give Sammy so that they will have the same amount of money?

Hi

A MD may not be necessary for this question.I have intentionally drawn the MD so that kids can see the sequence of events and understand the concept better.

Sammy and Jeremy shared 18 units altogether. For them to get equal amount of money, each must receive 9 units (18/2), hence Jeremy must give 2 units to Sammy (11-9).

Another way to look at this question, they have a total amount of 198. For them to have an equal amount of money, each must receive 99.Therfore the amount of money to be transferred is 22 (99-77 or 121-99)

Hope this helps.

Best wishes

http://farm9.staticflickr.com/8387/8578045267_b3856be6ee_z.jpg\">

[tianzhu]

fohope:

2) Randy and Kelly have the same number of books at first. After Randy gave away 25 books to Kelly, Randy has 3/8 as many books as Kelly. How many books id each of them have at first?

Hi

Randy gave away the books to Kelly, so the number of books shared by them remained the same before and after.

I've drawn more MD than necessary to show the flow of events.Once students get more familiar, they may consolidate the steps.

Hope this helps.

Best wishes

http://farm9.staticflickr.com/8087/8578028983_312a4cf3f5_z.jpg\">

[fohope]

Thanks, TianZhu.

It's so clear with the picture. You are such a wonderful person who really help all the mothers to gear up Primary Maths and teach our children.
:udaman:

[fohope]

Hi

Pls help me with this question.TIA

Jerome saved his money in 3 piggy banks. He has a total of Sgd 175 in piggy bank A and B, and a total of Sgd 423 in piggy banks B and C. If he saved 5 times as much money in piggy bank C as A , how much money did he save in piggy bank B?

Can anyone draw the model for this?

[BigDevil]

http://i49.tinypic.com/348j4sp.jpg\">

[cathycho]

need helps…


Trianne had 1/4 as many red pens as blue pens. After she bought 5 red pens and 5 blue pens, she had 1/3 as many red pens as blue pens. How many red pens did she have at first?

[tianzhu]

cathycho:

need helps..


Trianne had 1/4 as many red pens as blue pens. After she bought 5 red pens and 5 blue pens, she had 1/3 as many red pens as blue pens. How many red pens did she have at first?

Hi

Hope this helps.

Best wishes

http://farm9.staticflickr.com/8229/8591527305_5ea4c5f859_z.jpg\">

[cathycho]

tianzhu:

cathycho:

need helps..


Trianne had 1/4 as many red pens as blue pens. After she bought 5 red pens and 5 blue pens, she had 1/3 as many red pens as blue pens. How many red pens did she have at first?

Hi

Hope this helps.

Best wishes

http://farm9.staticflickr.com/8229/8591527305_5ea4c5f859_z.jpg\">

Got it. Thks for the nice model..

[tracywham]

Hi, I need help to solve these 2 problems:


a) A tank is 1/3 full. After 12 litres of water were added, it was 5/6 full.
What was the capacity of the tank?

b) A basket 1/2 full of longans has a mass of 8 kg. The same basket full of
longans has a mass of 11 kg. What is the mass of the empty basket?

[PiggyLalala]

5/6 -1/3 = 5/6-2/6 =3/6 =1/2

Therefore 1/2 the capacity of jar = 12 litres
Capacity of jar = 12×2=24 litres

B) 1/2 longan = 11-8 = 3 kg
Empty Basket:8 -3 =5kg