Q&A - PSLE Math

[Yu Xuan]

tianzhu:

mum2010:

Mary put some fifty-dollar notes and some ten-dollar notes into a piggy bank. There were a total of 60 notes. The total value of the fifyt-dollar notes and ten-dollar notes was equal. How much money did she put into the piggy bank?

Hi

Consider an equal value of $10.
You’ll have 1 number of $10 note and 2 number of $5 note. Altogether, you’ll have $20 and a total number of 3 notes.

Given that there are 60 notes altogether.

3 notes ------ $20
60 notes ------- S400

Best wishes

Hi Tianzhu

Should be $50 and $10.

Hence to equate the value
$50 --> 1 unit
$10 --> 5 units

6units --> 60
1 unit --> 60 / 6 = 10
5 units --> 10 * 5 = 50

($50 x 10) + ($10 x 50) =$1000

Is this answer correct?

[iFruit]

Andrew Lee:

Hi...

http://postimage.org/image/n5mxfo1w/
:?

Since we only need the sum

sum of angles a, b, c, d ,e = three triangles - (angles not including a,b,c,d,e) = 180 + 180 +180 - (180-20) - (180-120) = 540 - 160 -60 = 320

[tianzhu]

Hi Yu Xuan


Good Morning.

You’re correct. I’ve made a mistake in my earlier post by using $5 instead of $50.

Thank you for your correction.

Consider an equal value of $50.
You’ll have 1 number of $50 note and 5 number of $10 note. Altogether, you’ll have $100 and a total number of 6 notes.

Given that there are 60 notes altogether.

6 notes ------ $100
60 notes ------- $1000

Best wishes

[Yu Xuan]

Hi Tianzhu


Would you interpret the following statements as similar;

20% X $100 =$20

20/100 X $100 =$20

Especially the first statement, do you think it is acceptable?

Thank you.

Yu Xuan

[tianzhu]

Hi Yu Xuan


I looked through the PSLE Maths Guide (MC)

20% x $100 = 20/100 X $100

So, your two number statements should have similar meaning.

Best wishes

[tianzhu]

Hi moderator


Please delete this post.

Thanks.

Best wishes

[Yu Xuan]

tianzhu:

Hi Yu Xuan


I looked through the PSLE Maths Guide (MC)

20% x $100 = 20/100 X $100

So, your two number statements should have similar meaning.

Best wishes

Hi Tianzhu

Thank you. May I know which PSLE Math Guide you are refering to please.

Yu Xuan

[tianzhu]

Yu Xuan:

May I know which PSLE Math Guide you are refering to please.

Hi Yu Xuan

You're welcome.

PSLE Maths Revision Guide by Michelle Choo from Marshall Cavendish.

Best wishes

[Yu Xuan]

tianzhu:

Yu Xuan:

May I know which PSLE Math Guide you are refering to please.

Hi Yu Xuan

You're welcome.

PSLE Maths Revision Guide by Michelle Choo from Marshall Cavendish.

Best wishes

Hi Tianzhu

Thank you again.

Yu Xuan

[tianzhu]

Yu Xuan:

Hi Tianzhu

Thank you again.

Yu Xuan

Hi Yu Xuan

Good Morning.

You're welcome.

Best wishes