Q&A - P4 Math

[tianzhu]

CNS:

Thanks ! Can provide the answers as well ?

Hi

I've added answers for Q1 to Q5 and also a new question (Q10).

Best wishes

[htn]

small:

[quote]2.Esther spent 1/2 of her money on some pies and 4/7 of her remaining money on 8 loaves of bread. Each loaf of bread cost thrice as much as a pie. How many pies did she buy?


TIA

Hi htn,

HTH..

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Hi Small,

Thanks

[Charnic]

chloecube:

thks Tianzhu, pls correct me if i am wrong


Q1)
12 x 4 = 48
48 – 36 = 12
Difference = 4 + 2 = 6
12 / 6 = 2 birds
12-2 = 10 hamster

i have got all the answers, except for Q4

Pls advise why the difference is 6 ? Suffering from mental block this morning. Thanks

[chloecube]

CNS:

chloecube:

thks Tianzhu, pls correct me if i am wrong


Q1)
12 x 4 = 48
48 – 36 = 12
Difference = 4 + 2 = 6
12 / 6 = 2 birds
12-2 = 10 hamster

i have got all the answers, except for Q4

Pls advise why the difference is 6 ? Suffering from mental block this morning. Thanks

Hi CNS,

from what i learnt from Tianzhu (you may like to refer to the model by Tianzhu in previous page) , for every increase in 1 bird, the difference in the nos of legs drops by 6.

[tianzhu]

CNS:

Pls advise why the difference is 6 ? Suffering from mental block this morning. Thanks

Hi

Good Morning.

Chloecube has summarised the the steps.

Please have a look at the solution@ Thu Feb 02, 2012 11:28 am on page 26 of P4 Maths.

Best wishes

[Charnic]

:? Thought the difference in legs is 2 ?

[tianzhu]

CNS:

:? Thought the difference in legs is 2 ?

Hi

Please have a look at the solution@ Thu Feb 02, 2012 11:28 am on page 26 of P4 Maths.

Compare these two questions and note the difference.

1)Guo Cong Min has 12 pets which consist of birds and hamsters. All the hamsters have 36 more legs than all the birds. How many of his pets are birds? (2 birds, 10 hamsters)

5)Chun Hua visited a farm where she saw some ducks and goats. There were a total of 65 ducks and goats. She then counted the legs of the animals and found that there were 196 legs. How many ducks were there in the farm?(32)

Best wishes

[KSP]

1. If I distribute 10 oranges to each of the children, I will be short of 30 oranges and if I distribute 8 oranges to each of them, I will be short of 6 oranges. How many oranges and children are there?


2. A had 6 times as much money as B at first. After both received $300 each, A has thrice as much money as B. How much did A and B have at first?

[tianzhu]

KSP:

1. If I distribute 10 oranges to each of the children, I will be short of 30 oranges and if I distribute 8 oranges to each of them, I will be short of 6 oranges. How many oranges and children are there?

Hi

First question touches on Gap and Difference.

Gap ----- 30 - 6 ------ 24
Difference ------ 10 - 8 ------- 2

Number of children ------- 24/2 ------ 12

Number of oranges -------- (12*10) - 30 ------ 90 or (12*8) - 6 ------90

You can see more examples of such questions in previous posts.

Best wishes

[tianzhu]

KSP:

2. A had 6 times as much money as B at first. After both received $300 each, A has thrice as much money as B. How much did A and B have at first?

Hi

Due to time constraints, I'll give some pointers to draw the MD.

Draw 6 boxes to show A’s money.
Draw 1 box to show B’s money.

A ------ (1unit)(1unit)(1unit)(1unit)(1unit)(1unit)
B ------ (1unit)

Add 300 to the first 6 boxes.
Add 300 to the 1 box (B)

Now,1 big box ------ 1 unit + 300

A ------ (1unit + 300)(1unit + 300)( (1unit + 300)
B ------ (1unit + 300)

Compare A’s money

3 units + 900 ------ 6 units +300
3 units ----- 600
1 unit ------ 200

A+B ------ 7 units ------- 7*200 ------1400

Best wishes

For P5/6 ----- In addition to MD, students may also use the Units Method.