Q&A - P4 Math

[tianzhu]

Oldschool:

BTW, since Mr Tan start reading from Page 13, then Page 11 should also be minus away.


Regards

Hi

Thanks, I missed out 11.

Best wishes

[shurley197323]

tianzhu:

shurley197323:

(2) Mr Tan start to read a story book from Pade 13 until he completed the whole book. If there were 66 pages altogether, what was the sum of all the no is the odd-no pages he need ?

Thanks

Hi

We want to find the sum of the number of odd pages he read, not the total number of pages in the book.

Find the sum of the number of odd pages from page 1 to page 79 (13+66) which is equal to 1600 (square of 40)

From here, minus, the sum of the number of odd pages from page 1 to page 11 (6 pages) which is equal to 36

The sum -------1600 - 36 ------ 1564

Best wishes

Thank you & Sorry, Tianzhu,
I still can't get ( 1600 ) & (36) ?

Can help to show me step by step ?

Thks in advance.

[tianzhu]

shurley197323:

[Thank you & Sorry, Tianzhu,

I still can't get ( 1600 ) & (36) ?

Can help to show me step by step ?

Thks in advance.

Hi

From 1 to 79, there are 40 number of odd numbers.

sum of odd numbers from 1 to nth term ------ n*n (n square)

40*40 ----- 1600

36 is the sum of odd numbers from 1 to 11 (1+3+5+7+9+11)

Best wishes

[Always21]

Pls help with this


There are three bottles of beads. The second bottle contains 5/7 of the number of beads in the first bottle. The third bottle contains 1/2 of the number of beads in the second bottle. The difference between the number of beads in the first and third bottle is 27. What is the sum of the beads in the three bottles?

Really need help

Thanks in advance.

[PapayaDad]

A=14u

B=10u
C=5u
Total=29u

A-C=27
14u-5u=27
9u=27
u=3
Total=29x3= 87

[Always21]

PapayaDad:

A=14u

B=10u
C=5u
Total=29u

A-C=27
14u-5u=27
9u=27
u=3
Total=29x3= 87

Sorry PapayaDad,

My son does understand how you got the A=14u, B=10u and C=5u

Sorry to trouble you.

[Always21]

quekcc:

Always21:

Pls help with this


There are three bottles of beads. The second bottle contains 5/7 of the number of beads in the first bottle. The third bottle contains 1/2 of the number of beads in the second bottle. The difference between the number of beads in the first and third bottle is 27. What is the sum of the beads in the three bottles?

Really need help

Thanks in advance.

One way is

the lcm of 2 and 7 is 14.

So you can let the number of beads in 2nd bottle be 10 units, then 3rd bottle will be 5 units and 1st bottle will be 14 units.

14 - 5 = 9 units = 27 beads, so 1 unit = 3 beads.

Sum = 3 x (14 + 10 + 5) = 3 x 29 = 3 x (30 - 1) = 90 -3 = 87.

Sorry,
My son was asking if there is a way to use model drawing as the one you have are using algebra which they are not taught yet

Sorry for the trouble.

[Oldschool]

Always21:

Sorry,
My son was asking if there is a way to use model drawing as the one you have are using algebra which they are not taught yet

Sorry for the trouble.

Hi,

http://i40.tinypic.com/335d2ya.jpg\">

Regards

[Always21]

Oldschool:

Always21:

Sorry,
My son was asking if there is a way to use model drawing as the one you have are using algebra which they are not taught yet

Sorry for the trouble.

Hi,

http://i40.tinypic.com/335d2ya.jpg\">

Regards

Thank you very much. He got it!! Thanks

[Always21]

Oldschool:

Always21:

Sorry,
My son was asking if there is a way to use model drawing as the one you have are using algebra which they are not taught yet

Sorry for the trouble.

Hi,

http://i40.tinypic.com/335d2ya.jpg\">

Regards

Thank you very much. He got it!! Thanks