Q&A - P5 Math

[tianzhu]

Symum:

Hi, need help to solve this question. Andrew had $268 and Brett had $172 at first. Each of them bought a pair of skates at the same price. After their purchase, Andrew had 5 times as much money left as Brett. How much did each pair of skates cost?

Hi

You may use UM(Units Method) or MD.

Andrew and Brett bought a pair of skates at the same price.
The difference between Andrew’s initial amount and Brett’s initial amount remains the same.

After the purchase

Andrew ------- 5 units
Brett ------- 1 unit
Difference ------ 4 units

268 -172 ------ 96

4 units -------96
1 unit ------ 24

Cost of a pair of skates ------ 172 - 24 ------148

Best wishes

[Symum]

:thankyou:

[MUMMYOF3]

Hi,

Can someone help with the following question ?

540 trees are to be planted along the perimeter of a square garden so that there will be an equal number of trees along each side of the garden.
How many trees must be planted along each side of the garden?

[tianzhu]

Hi Symum


You’re welcome.

Best wishes

[tianzhu]

MUMMYOF3:

Hi,

Can someone help with the following question ?

540 trees are to be planted along the perimeter of a square garden so that there will be an equal number of trees along each side of the garden.
How many trees must be planted along each side of the garden?

Hi

Assuming that one tree is planted at each corner of the square garden. This gives us 4 trees at 4 corners. It helps to draw a simple diagram.

540 - 4 -----536

536/4 -----134

134 + 2 ----- 136

Best wishes

[MUMMYOF3]

Hi Tianzhu,


Thanks. My boy got the ans as 136 too but different working as yours. Not sure if the following is acceptable ?

540 + 4 = 544

544 / 4 = 136

[tianzhu]

MUMMYOF3:

Hi Tianzhu,

Thanks. My boy got the ans as 136 too but different working as yours. Not sure if the following is acceptable ?

Hi MUMMYOF3

You’re welcome.

There is usually more than one way to go about.

So long as he understands the logic behind his workings,it is acceptable.

Some students may also see it this way.

540/4 ----- 135
135 + 1 ----- 136

More importantly is students are able to apply the concepts to solve similar type of questions in examinations.

Best wishes

[Chan09]

Need some help:

Tan bought some mangoes and apples for $86.50. A mango and an apple cost $11 in all. He bought more mangoes than apples and the mangoes cost $42.50 more. How many apples did he buy?
Ans: 4

Thank you

[tianzhu]

Chan09:

Tan bought some mangoes and apples for $86.50. A mango and an apple cost $11 in all. He bought more mangoes than apples and the mangoes cost $42.50 more. How many apples did he buy?

Hi

You may use “Grouping Concept”.

86.5 – 42.5 -------44

Consider a group of 1 mango and 1 apple that costs $11

44/11 ----- 4

There are 4 groups.

Hence, 4 apples

Best wishes

[Chan09]

Couldn’t figure this one: what is the greatest number of right angles that a 5 sided figure can have? Ans: 4

I couldn’t draw the figure? Thanks