Q&A - P3 Math

[Steadyberry]

Hi mother777


Thx for yr explanation. I get it now.

[GreenQ]

Sorry dear parents, need solution for the question below.


Draw diagrams / Guess and Check.

There are 8 goats and ducks altogether.
Some had 2 legs and some had 4 legs.
The animals have 20 legs in all.
How many goats are there?

Thanks.

P/s: The sch teacher said to get as less as possible for the number of goats.

[catddy2002]

GreenQ:

Sorry dear parents, need solution for the question below.


Draw diagrams / Guess and Check.

There are 8 goats and ducks altogether.
Some had 2 legs and some had 4 legs.
The animals have 20 legs in all.
How many goats are there?

Thanks.

P/s: The sch teacher said to get as less as possible for the number of goats.

Hi,

This is my format.
Not sure whether your child need to follow his/her teacher's format.

[catddy2002]

Sorry, missed out the picture!

Here you are.

http://i48.tinypic.com/351iomc.jpg\">

[GreenQ]

Great! Thanks for your prompt reply... :love: :thankyou:

[Maths Olympiad Tutor]

quekcc:

GreenQ:

Sorry dear parents, need solution for the question below.


Draw diagrams / Guess and Check.

There are 8 goats and ducks altogether.
Some had 2 legs and some had 4 legs.
The animals have 20 legs in all.
How many goats are there?

Thanks.

P/s: The sch teacher said to get as less as possible for the number of goats.

Draw diagram.

http://i46.tinypic.com/2njysuq.png\">

When we assume there are 8 goats, there will be 32 legs, 12 more than what is mentioned.

A goat has 2 more legs than a duck.

Since there are 12 extra legs, there must be 12 / 2 = 6 ducks.

8 - 6 = 2 goats.

[mother777]

Ok here goes my method…


There are 8 goats and ducks altogether.
Some had 2 legs and some had 4 legs.
The animals have 20 legs in all.
How many goats are there?

Answer…
Assume all are ducks…
each duck–>2 legs
If 8 ducks, total legs–>8 x 2 = 16
balance legs–>20-16 = 4
these extra legs are from goats.
each goat 2 extra leg.
so number of goat–>4/2 = 2

Goat–>2
duck–>8-2 = 6…

[GreenQ]

Thanks and appreciate all for yours replies! :thankyou:

[GreenQ]

mother777:

Ok here goes my method..


There are 8 goats and ducks altogether.
Some had 2 legs and some had 4 legs.
The animals have 20 legs in all.
How many goats are there?

Answer..
Assume all are ducks..
each duck-->2 legs
If 8 ducks, total legs-->8 x 2 = 16
balance legs-->20-16 = 4
these extra legs are from goats.
each goat 2 extra leg.
so number of goat-->4/2 = 2

Goat-->2
duck-->8-2 = 6..

Thanks mother777. My child's teacher used exactly the same method as yours!

[mother777]

well that is good to know

the best thing about this method is that guessing is eliminated.

so once you get answer and your working is correct..then you can be sure that your answer is correct only..