Q&A - P5 Math

[tianzhu]

chloecube:

i didnt use the \"49 children\" as a clue
is it correct?

Hi

Yes, you can use the Grouping concept.

But, basing on your revised solution, there will be 231 girls and 308 boys.

I suggest you check with the teacher on the discrepancies.

Best wishes

[purple05]

1. At a concert, the number of men is 4/7 of the number of women. There are 440

adults altogether. How many women are there in the concert?

Ans = 280
But how do I explain to my child, 4parts = men & 7 parts = women?

2. ½ of Joshua’s savings is equal to 4/5 of Megan’s savings. The difference between
their savings is $15. What is Megan’s total savings?


Ans = $25?

But when i work backwards I dun seem to get $25, is my ans correct?

[MathIzzzFun]

chloecube:

1001 card were given to 49 children. 3/7 were girls.each boy received the same number of cards. each girl received thrice as much as each boy.how many more card did the all girls received as all the boys?


is the answer 385?

Number of girls -> 21
Number of boys -> 28

cards given out :

1 boy - > 1u, 28 boys-> 28u

1 girl -> 3u, 21 girls -> 63u

Total cards -> 28u + 63u= 91u --> 1001

1u -> 11

63x11-28x11 = 385

all the girls received 385 more cards than the boys.


cheers.

[chloecube]

MathIzzzFun:

chloecube:

1001 card were given to 49 children. 3/7 were girls.each boy received the same number of cards. each girl received thrice as much as each boy.how many more card did the all girls received as all the boys?


is the answer 385?

Number of girls -> 21
Number of boys -> 28

cards given out :

1 boy - > 1u, 28 boys-> 28u

1 girl -> 3u, 21 girls -> 63u

Total cards -> 28u + 63u= 91u --> 1001

1u -> 11

63x11-28x11 = 385

all the girls received 385 more cards than the boys.


cheers.

thks MathIzzzFun

can i also use this method?

drew 7 units, 3 units for girls and 4 units for boys
since each girl received 3times as each boy
so i put 3 in each unit of the girls and 1 for each unit of the boys
total 13 in each group
1001 / 13 = 77 groups
the number of boys get - 77 x 4 = 308
the number of girls get - 77 x 9 =693
693 - 308 = 385

i didnt use the \"49 children\" as a clue though

[tianzhu]

purple05:

1. At a concert, the number of men is 4/7 of the number of women. There are 440

adults altogether. How many women are there in the concert?

Ans = 280
But how do I explain to my child, 4parts = men & 7 parts = women?

Hi

You may use MD.

Draw 4 boxes to show the number of men.

Draw 7 boxes to show the number of women.

11 boxes ----- 440

1 box ----- 40

Number of women ------- 7 boxes ------- 7*40 ------280

Best wishes

[tianzhu]

purple05:

2. ½ of Joshua’s savings is equal to 4/5 of Megan’s savings. The difference between
their savings is $15. What is Megan’s total savings?


Ans = $25?

But when i work backwards I dun seem to get $25, is my ans correct?

Hi

Draw 5 boxes to show Megan’s savings. Shade 4 boxes.

Draw 8 boxes to show Joshua’s savings. Shade 4 boxes and try to align them with those of Megan.

Difference ------ 3 boxes

3 boxes ------ 15

1 box ------- 5

Megan’s total savings ------ 5 boxes ------- 25

Best wishes

[andyle.024255sg]

tianzhu:

purple05:

2. ½ of Joshua’s savings is equal to 4/5 of Megan’s savings. The difference between
their savings is $15. What is Megan’s total savings?


Ans = $25?

But when i work backwards I dun seem to get $25, is my ans correct?

Hi

Draw 5 boxes to show Megan’s savings. Shade 4 boxes.

Draw 8 boxes to show Joshua’s savings. Shade 4 boxes and try to align them with those of Megan.

Difference ------ 3 boxes

3 boxes ------ 15

1 box ------- 5

Megan’s total savings ------ 5 boxes ------- 25

Best wishes

Hi purple05,

The method is about using equivalent fractions. There are two fractions 1/2 and 4/5, we try to make the numerators of these fractions become the same to solve this exercise.

1/2 = 4/8
4/5 stays the same

Hence, we have 4/8 of Joshua's savings is equal to 4/5 of Megan's savings. We can use 4 boxes to represent this equal part. Thus, Joshua's savings is 8 boxes in total, while Megan's savings is 5 boxes in total.

The next step is basic and your child can easily continue.

Further Discussion: If the question gives: 3/4 of Joshua's savings = 4/5 of Megan's savings, then we can do as below:
3/4 = 12/16
4/5 = 12/15

Cheers.

[Jamesbond]

Lim distributed 300 souvenirs from the art museum to some girls in P4 and P5. Each P4 girl received 5 souvenirs and each P5 girl received 3 souvenirs. The P4 girls received 60 more souvenirs than those in P5. How many more P5 girls were there?

Pl help…

[purple05]

my method is 1/2-1/5 = $15

5/10-2/10 = $15
3 units = $15
1 unit = $5
5 units = $25

my method correct?

[speedmaths.012624com]

Jamesbond:

Lim distributed 300 souvenirs from the art museum to some girls in P4 and P5.
Each P4 girl received 5 souvenirs and each P5 girl received 3 souvenirs. The P4 girls received 60 more souvenirs than those in P5.
How many more P5 girls were there?

Hi,

Lim distributed 300 souvenirs,
The P4 girls received 60 more souvenirs than those in P5

P5 girls received (300 - 60) / 2 = 120 souvenirs,
P4 girls received (300 + 60) / 2 = 180 souvenirs,

Each P5 girl received 3 souvenirs,
There were 120 / 3 = 40 P5 girls

Each P4 girl received 5 souvenirs,
There were 180 / 5 = 36 P4 girls

40 - 36 = 4 (more P5 girls)

Hope this helps.

speedmaths.com

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