Q&A - P3 Math

[teachingmum]

Hi, you may like to try the Guess and Check Method. This is a rather easy method which the younger or weaker pupils like…


No of Cows/ No of chickens/ Total no of cows’ legs/ Total no of chickens’ legs/ Difference

14 14 56 28 28
15 13 60 26 34
16 12 64 24 40 *


There are 16 cows and 12 chickens in the farm.[/list]

[tianzhu]

Hi


Besides Guess and Check, you may also use a problem solving heuristics called Make a Supposition or Assuming method.

Hope this helps.

Best wishes.

http://farm5.static.flickr.com/4088/5092600515_9cc75f1dac_b.jpg\">

[match3frog]

Thanks so much teaching mum and tianzhu!


dd can do the guess and check method but I want her to learn the other method by tianzhu.

Tianzhu, thanks alot for the nice illustration!

[tianzhu]

match3frog:

Tianzhu, thanks alot for the nice illustration!

Hi

You're welcome.

Best wishes

[tinasen]

Samy had 4 times money that of Mary at first. After Samy gave $45 to Mary, both of them had equal amount of money. How much did Mary have at first? Please help to solve this by model method. I tried to understand the answer key that was given to my son, but not very sure how 3u is equated to 45.

[mrswongtuition]

tinasen:

Samy had 4 times money that of Mary at first. After Samy gave $45 to Mary, both of them had equal amount of money. How much did Mary have at first? Please help to solve this by model method. I tried to understand the answer key that was given to my son, but not very sure how 3u is equated to 45.

S [___][___][___][___]
M [___]

to make the units into whole numbers (so tt S can give to M):

S [__][__][__][__][__][__][__][__]
M [__][__] .................[-----45----]

S must give M 3u for them to have equal amount of money.

3u -> $45
1u -> $15
2u -> $30

[tinasen]

Thanks a lot! It really helps me so much at this 11th hour - doing revision for my son.

mrswongtuition:

tinasen:

Samy had 4 times money that of Mary at first. After Samy gave $45 to Mary, both of them had equal amount of money. How much did Mary have at first? Please help to solve this by model method. I tried to understand the answer key that was given to my son, but not very sure how 3u is equated to 45.

S [___][___][___][___]
M [___]

to make the units into whole numbers (so tt S can give to M):

S [__][__][__][__][__][__][__][__]
M [__][__] .................[-----45----]

S must give M 3u for them to have equal amount of money.

3u -> $45
1u -> $15
2u -> $30

[elkniwt]

Dear tianzhu,


:salute: Thumbs up for your nice illustration! Wonder how you do it! really cool!

[tianzhu]

elkniwt:

Dear tianzhu,


:salute: Thumbs up for your nice illustration! Wonder how you do it! really cool!

Hi elkniwt

I am glad you liked it.

I use Microsoft PowerPoint 2007 to do the solutions.

Best wishes

[Muffins]

Hi Tianzhu, where exactly do you get the images?? Most of the time they are exactly relating to the question