Q&A - P5 Math

[Oldschool]

2632parent:

Mary and Alice had a total of 1020 marbles.After Mary gave away 1/2 of her marbles and Alice gave away 84 marbles, the ratio of the number of Mary's marbles to the number of Alice's marbles became 5:3. What was the ratio of the number of Mary's marbles to the number of Alice' marbles at first :lovesite: :? :thankyou: :udaman:

Hi,

http://i39.tinypic.com/21479jr.jpg\">

Regards

[hazelwong]

Hi, can anyone please help with this question?


Observe the following statements:
A+B+C=26
A-B=6
C-B=2
i) Insert a pair of brackets ( ) in the number statement below to illustrate the correct working order to find the value of A
26 – 2 – 6 ÷ 3 + 6
ii) what is the value of A?
Thanks :?:

[cookieandmonster]

Please help.


Fang had some boxes of fruits for sale. She sold 35 boxes on Monday. She sold 1/5 of the remaining boxes of fruits on Tuesday. Then she had 1/3 of the total number of boxes of fruits left. How many boxes of fruits did she have at first?

[The Right Equation]

cookieandmonster:

Please help.


Fang had some boxes of fruits for sale. She sold 35 boxes on Monday. She sold 1/5 of the remaining boxes of fruits on Tuesday. Then she had 1/3 of the total number of boxes of fruits left. How many boxes of fruits did she have at first?

http://i40.tinypic.com/qosns9.jpg\">

[The Right Equation]

cookieandmonster:

Please help.


Fang had some boxes of fruits for sale. She sold 35 boxes on Monday. She sold 1/5 of the remaining boxes of fruits on Tuesday. Then she had 1/3 of the total number of boxes of fruits left. How many boxes of fruits did she have at first?

method 2

http://i40.tinypic.com/f56btf.jpg\">

method 1 preferred, as for most students, it is easier to derive the ratio units in method 1, than draw the model above for method 2.

[MathIzzzFun]

hazelwong:

Hi, can anyone please help with this question?


Observe the following statements:
A+B+C=26
A-B=6
C-B=2
i) Insert a pair of brackets ( ) in the number statement below to illustrate the correct working order to find the value of A
26 – 2 – 6 ÷ 3 + 6
ii) what is the value of A?
Thanks :?:

(26 - 2 - 6) ÷ 3 + 6
...(26-2-6) gives 3B

A = 12

cheers

[MathIzzzFun]

cookieandmonster:

Please help.


Fang had some boxes of fruits for sale. She sold 35 boxes on Monday. She sold 1/5 of the remaining boxes of fruits on Tuesday. Then she had 1/3 of the total number of boxes of fruits left. How many boxes of fruits did she have at first?

Using equal fractions method:

4/5 remainder = 1/3 Total = 4/12 Total
Total -> 12 units
Remainder -> 5 units
7 units -> 35
Total -> 35/7 x 12 = 60

cheers.

[MathIzzzFun]

veraclari:

Hi Parents


Just wondering. . For some Fractions Ratio why must we change the numerator to common multiple?

Eg. Lyn and Jen had 160 marbles. After LYN SOLD 3/5 Of her marbles , Jen sold 4/7 of hers, they had the same no. Of marbles left.
How many did Lyn has at first?

The Model Answer gave step 1 as changing the numerator to the same numerator. Why must they do that?


Another qn also same step 1 : 2/3 of Shaun's money is equal yo 4/5 of Micah's money. If Shaun gives $240 to Micah, yhey each will have e same amount of money. How much money does Shaun have? How much money do they have altogether?
Thanks A lot!!!

Hope this helps :

explanation of equal fraction method -
http://www.tinyurl.com/mathizzzfun-equalfractions

questions posted in the forum:

1) Esther had $350 more than Kevin. Ester spent 3/4 of her money & Kevin spent 4/7 of his money. In the end, Kevin & Esther had the same amout of money left. Find the amout of money Kevin had at first.

2)At the graduation ceremony, there were 30 less boys than girls.After 3/5 of the boys & 5/8 of the girls had left the hall for recess, there was an equal number of boys & girls that remained behind. Find the number of boys who were presented at the graduation ceremony at first.
@ http://www.kiasuparents.com/kiasu/forum/viewtopic.php?f=67&t=25121&hilit=equal+fraction&start=1260

Carol paid $72 for 2 blouses and 1 dress.5 blouses cost as much as 2 dresses.How much more did she pay for each dress than a blouse?
@ http://www.kiasuparents.com/kiasu/forum/viewtopic.php?f=67&t=25121&p=867458&hilit=equal+fraction#p867458

Mary spent $16.50 of her pocket money on a compact disc. She spent 1/5 of the remainder on a story book. She still had half of her money left.
a) How much was the storybook
b) How much was her pocket money?
@ http://www.kiasuparents.com/kiasu/forum/viewtopic.php?f=68&t=25129&p=816918&hilit=equal+fraction#p816918

James and Bond had $728 altogether. When James spent 1/4 of his money and Bond spend 2/3 of his, they found out that each had an equal amount of money left. How much did James have at first ?
@ http://www.kiasuparents.com/kiasu/forum/viewtopic.php?f=69&t=280&p=961760&hilit=equal+fraction#p961760

There were 3/5 as many adults as children on a bus.At the next stop 6 adults and 6 children boarded the bus.As a result,there were 2/3 as many adults as children on the bus.How many people were on the bus at first?
@ http://www.kiasuparents.com/kiasu/forum/viewtopic.php?f=68&t=25129&p=960597&hilit=equal+fraction#p960597

Jenny had 3/7 as much money as Kenny. If they spent $252 each, Jenny's money will be only 2/7 of Kenny's. How much money did Kenny have more than Jenny
@ http://www.flickr.com/photos/mathizzzfun/8612801525/in/set-72157633150783002

cheers.

[2Transformer]

Hi, can someone help me on this question?



Keith had a number of books for sale. He sold 560 books on Saturday. On Sunday, he sold 1/5 of the remaining books and was left with 40 books. How many books did he have at first?

[veraclari]

Thanks A lot Mathizzfun!!!


I’ve seen quite a few qn and answers but still didn’t understand WHY they did it this way but the link to ur page sure help explaining LoTs!!!

Thanks!