Q&A - P4 Math

[Mychildren]

Its all right. Its all depends on which method you and your child is comfortable with.

[chloecube]

Andy n Ben have $680 altogether. After Andy spent 1/3 of his money n Ben spent 1/4 of his money, they will have equal amount of money left. How much did Ben have at first?

[MathIzzzFun]

chloecube:

Andy n Ben have $680 altogether. After Andy spent 1/3 of his money n Ben spent 1/4 of his money, they will have equal amount of money left. How much did Ben have at first?

Hi

Andy and Ben had equal amount left. So,
2/3 Andy's money = 3/4 Ben's money
6/9 Andy's money = 6/8 Ben's money
Andy's money --> 9 units
Ben's money --> 8 units
Ben's money at first = 8/17 x $680 = $ 320

cheers.

[chloecube]

thks mathIzzzFun,


so for this type of question is to change the nemerator to the same instead of denominator.

thks

[MathIzzzFun]

chloecube:

thks mathIzzzFun,


so for this type of question is to change the nemerator to the same instead of denominator.

thks

Hi

it is \"shortcut\" to determine the ratio.. the rationale can be understood easily when we draw the model as shown below:

http://i49.tinypic.com/2vljic9.png\">

cheers.

[chloecube]

MathIzzzFun:

chloecube:

thks mathIzzzFun,


so for this type of question is to change the nemerator to the same instead of denominator.

thks

Hi

it is \"shortcut\" to determine the ratio.. the rationale can be understood easily when we draw the model as shown below:

http://i49.tinypic.com/2vljic9.png\">

cheers.

understood, thks

[raysusan]

Chrystal had 4 times as many stamps as Shaun. After Chrystal gave away 396 stamps Shaun had thrice as many stamps as Chrystal. What is the total number of stamps both of them have at first?



please help me in this question .Thank you in advanced. :thankyou:

[MathIzzzFun]

raysusan:

Chrystal had 4 times as many stamps as Shaun. After Chrystal gave away 396 stamps Shaun had thrice as many stamps as Chrystal. What is the total number of stamps both of them have at first?



please help me in this question .Thank you in advanced. :thankyou:

Hi


http://i47.tinypic.com/1jb5w8.png\">

cheers.

[Sharmum]

Hi,


Please help me with this question, I am confused…

In a Mathis quiz, a correct answer would earn Raju 5 points while every wrong answer would cost 2 points to be taken away. For every 3 questions that Raju answered, he would get 2 of them correct . If Raju earn 3
48 points altogether, how many questions did he answer in all?

Many thanks!

[tianzhu]

Sharmum:

Hi,


Please help me with this question, I am confused.....

In a Mathis quiz, a correct answer would earn Raju 5 points while every wrong answer would cost 2 points to be taken away. For every 3 questions that Raju answered, he would get 2 of them correct . If Raju earn 3
48 points altogether, how many questions did he answer in all?

Many thanks!

Hi

I'll take it as 348 points.

You may use ‘Grouping concept”

Consider a group of 3 questions.
2 correct and 1 wrong -------- 8 points

43 groups ------- 344 points

348 – 344 ----- 4 points

2 correct and 3 wrong ------- 4 points

Number of question ------- (43*3) + 5 ------- 134

Best wishes