Q&A - PSLE Math

Academic support for Primary 6 and PSLE
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Jmaths.SG
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Re: Q&A - PSLE Math

Post by Jmaths.SG » Thu Apr 07, 2016 1:24 am

SOS mum wrote:Hi, ps help. Many thks and God Bless:)

1) Irene, Doreen, Shawnia and Ruth made some balloons. Doreen made 252 balloons at first. Ruth donated some of her balloons and her number of balloons decreased by 20%. Irene made another 40% of her balloons. Shawnia gave away 30 fewer balloons than what Doreen had made. In the end, they had an equal number of balloons. How many balloons did they make altogether at first?

2) In a bakery shop, there are some curry, sardine and kaya buns. There are 216 more curry than sardine buns. There is 3 times as many curry as kaya buns. There is 12% as many sardine buns as the total number of buns. How many buns are there in the bakery shop?

(3) Mrs Letilia made 45 fewer dumplings than Mrs Hagans. Mrs Hagans decided to give 20% of her dumplings to Mrs Letilia. Mrs Letilia then gave 2/3 of her dumplings to Mrs Hagans. In the end, Mrs Hagans had 69 more dumplings than Mrs Letilia. How many dumplings did Mrs Hagans give to Mrs Letilia?
(1)
Image

(2)
Image

(3)
Since 20% was given from H to L, let L be 5u

L: 5u
H: 5u + 45

H gave 20% to L.
20% of 5u = 1u
20% of 45 = 9

L: 6u + 9
H: 4u + 36

L gave 2/3 to H.
2/3 of 6u = 4u
2/3 of 9 = 6

L: 2u + 3
H: 8u + 42

H has 69 more than L.
69 = 6u + 39
6u = 30
1u = 5

1u + 9 = 5+9 = 14.
H gave 14 to L in the first place.

SOS mum
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Re: Q&A - PSLE Math

Post by SOS mum » Fri Apr 08, 2016 8:40 am

Ender wrote:
SOS mum wrote:Mrs Wong prepared some orange syrup in a large pot. She transferred 60% of the syrup into an empty bottle. 75% of the remaining syrup was poured in to a mug leaving 210 litres of syrup left in the pot. Given that the bottle was 70% full, how much more would Mrs Wong need to prepare to fill up the bottle completely?
After she transferred 60% to a bottle, there will be 40% left in the pot.

75% of the remainder 40%, is also 3/4 of the remainder 40%. 3/4 of the 40% remainder went to the mug means 30% went into the mug, and 10% left in the pot.
Therefore 10% => 210 litres.
60%=> 1260 litre, that's to the bottle.

70% of bottle = > 1260 litres,
She needs 30% more to fill up the bottle,
10% => 1260/7 = 180 Litres
30% = > 540 litres#
Thank you very much. Ender :thankyou:

SOS mum
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Re: Q&A - PSLE Math

Post by SOS mum » Fri Apr 08, 2016 8:41 am

Jmaths.SG wrote:
SOS mum wrote:Mrs Wong prepared some orange syrup in a large pot. She transferred 60% of the syrup into an empty bottle. 75% of the remaining syrup was poured in to a mug leaving 210 litres of syrup left in the pot. Given that the bottle was 70% full, how much more would Mrs Wong need to prepare to fill up the bottle completely?

2) Yvonne, Maple and Florence were given an equal number of pins to decorate their rooms. Yvonne used 60% of her pins, Florence used 20% more pins than Yvonne and Maple used 48 pins. Given that they had a total of 78 pins left, how many pins were given to each of them at first?

3) There are 15 fewer rings than bracelets in a shop. There is 21 more bracelets than necklaces. There is 23 more hairclips than rings. There is 2/9 as many necklaces as bracelets and hairclips. How many rings are there in the shop?
[1]
25% of remaining syrup = 210 litres
100% of remaining syrup = 840 litres

Since Remaining syrup = 40% of syrup,
40% of syrup = 840 litres
60% of syrup = 1260 litres

Since 60% of syrup = 70% of bottle,
70% of bottle = 1260 litres
30% of bottle = 540 litres

[2]
Y (used) = 60%
Y (unused) = 40%

F (used) = 120% of 60% = 72%
F (unused) = 28%

M (used) = 48
M (unused) = 100% - 48

Left = 40% + 28% + (100% - 48) = 78
168% = 126
100% = 75

[3]
Image
Thank you very much. Jmaths :thankyou:

SOS mum
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Re: Q&A - PSLE Math

Post by SOS mum » Fri Apr 08, 2016 8:43 am

Ender wrote:
SOS mum wrote:Sorry, some more qns:

At the Woodlands Checkpoint, there were 24 more cars than lorries waiting at the gantry for clearance at first. After 2/3 of the cars and 20% of the lorries had cleared the gantry, there were 20 fewer cars than lorries waiting at the gantry. How many cars had cleared the gantry?
Let Lorry = 15L
C = 15L + 24

After 2/3 of the cars cleared the gantry, 1/3 of the cars is left
C2 = 5L + 8 ,From (15L+28)/3

After 20% of the Lorry cleared the gantry, 80% of the Lorry is left
L2 = 12L ,From 0.8 X 15L

L2 - C2 = 20
12L - 5L - 8 = 20
7L -8 = 20
7L= 28
L = 4

C = 15L +24 = 15(4) + 24 = 84
Car that cleared the gantry = 2/3 X 84 = 56#
SOS mum wrote: (2) Mrs Sharee bought a total of 38 cups and saucers for her upcoming party. She bought 10 more cups than saucers. The cost of a saucer was 2/9 of the total cost of a cup and a saucer. Given that she paid a total of $215.60 for all the cups and saucers, what was the cost of a cup?
Find number of cups and saucer. From simple modelling should derive the following equation.
Saucer = (38 -10) / 2 = 14
Cup = 24

Let the cost of one set of Saucer plus Cup be 9u,
Therefore each Saucer cost 2u and each Cup cost 7u. From saucer cost 2/9 of the total a cup + saucer

Total cost of Saucers = 14 X 2u = 28u
Total cost of Cups = 24 X 7u = 168u

Total cost = 168u + 28 u = 196u = $215.60
u = 1.1

One Cup = 7u = 7(1.1) = $7.70#
Thank you very much. Ender :lovesite:

SOS mum
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Re: Q&A - PSLE Math

Post by SOS mum » Fri Apr 08, 2016 8:44 am

Jmaths.SG wrote:
SOS mum wrote:Hi, ps help. Many thks and God Bless:)

1) Irene, Doreen, Shawnia and Ruth made some balloons. Doreen made 252 balloons at first. Ruth donated some of her balloons and her number of balloons decreased by 20%. Irene made another 40% of her balloons. Shawnia gave away 30 fewer balloons than what Doreen had made. In the end, they had an equal number of balloons. How many balloons did they make altogether at first?

2) In a bakery shop, there are some curry, sardine and kaya buns. There are 216 more curry than sardine buns. There is 3 times as many curry as kaya buns. There is 12% as many sardine buns as the total number of buns. How many buns are there in the bakery shop?

(3) Mrs Letilia made 45 fewer dumplings than Mrs Hagans. Mrs Hagans decided to give 20% of her dumplings to Mrs Letilia. Mrs Letilia then gave 2/3 of her dumplings to Mrs Hagans. In the end, Mrs Hagans had 69 more dumplings than Mrs Letilia. How many dumplings did Mrs Hagans give to Mrs Letilia?
(1)
Image

(2)
Image

(3)
Since 20% was given from H to L, let L be 5u

L: 5u
H: 5u + 45

H gave 20% to L.
20% of 5u = 1u
20% of 45 = 9

L: 6u + 9
H: 4u + 36

L gave 2/3 to H.
2/3 of 6u = 4u
2/3 of 9 = 6

L: 2u + 3
H: 8u + 42

H has 69 more than L.
69 = 6u + 39
6u = 30
1u = 5

1u + 9 = 5+9 = 14.
H gave 14 to L in the first place.
Thank you very much. Jmaths :lovesite:


dglaw
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Re: Q&A - PSLE Math

Post by dglaw » Tue Apr 12, 2016 5:18 am

Hi All,

I am new to this forum, please pardon me if I do something wrong

I have been using this "My Pals are Here! (1-6) Math" to teach my kids. Now, I would like to buy all the Secondary math books (from 1 to 5). Please recommend me the books. Thank you very much.
regards,
Diana

questionable_i
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Re: Q&A - PSLE Math

Post by questionable_i » Sat Apr 16, 2016 10:00 pm

dglaw wrote:Hi All,

I am new to this forum, please pardon me if I do something wrong

I have been using this "My Pals are Here! (1-6) Math" to teach my kids. Now, I would like to buy all the Secondary math books (from 1 to 5). Please recommend me the books. Thank you very much.
regards,
Diana
Maybe you can refer to this webpage, this webpage might help you in getting Secondary Maths Books. http://sgmathtuition.blogspot.sg/2015/1 ... s-for.html Hope this answers your question.

taringal
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Re: Q&A - PSLE Math

Post by taringal » Sun Apr 17, 2016 11:53 am

Hi,

Please help on this question. Thank you.

Patrick, Devi and Jiamin each have the same number of beads. How many beads must Devi give to Patrick and Jiamin so that Patrick has 20 beads more than Devi and Jiamin has 4 fewer beads than Patrick?

numeric
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Re: Q&A - PSLE Math

Post by numeric » Sun Apr 17, 2016 11:29 pm

taringal wrote:Hi,

Please help on this question. Thank you.

Patrick, Devi and Jiamin each have the same number of beads. How many beads must Devi give to Patrick and Jiamin so that Patrick has 20 beads more than Devi and Jiamin has 4 fewer beads than Patrick?
Image

S-H
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Re: Q&A - PSLE Math

Post by S-H » Fri Apr 22, 2016 11:09 pm

Please help the following qtn, thks!
Find the smallest positive integer, n, such that 42n is a multiple of 180

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