Q&A - P4 Math

[Sharmum]

Hi,


Appreciate if someone can help on this one:-

Kelvin and Ron had $135 altogether. After kelvin spent 2/5 of his money and Ron spent $79, they had an equal amount of money left. How much did Kelvin have at first?

Thank you.

[Jamesbond]

Sharmum:

Hi,


Appreciate if someone can help on this one:-

Kelvin and Ron had $135 altogether. After kelvin spent 2/5 of his money and Ron spent $79, they had an equal amount of money left. How much did Kelvin have at first?

Thank you.

Let me try...

135 - 79 = 56

56 / 8 = 7

7 * 5 = 35

Ans - $35...

[Jamesbond]

http://i49.tinypic.com/2vb8y2s.jpg\">


Pl help.

[kwcllf]

Jamesbond:

http://i49.tinypic.com/2vb8y2s.jpg\">


Pl help.

Area of floor = 25 x 20 = 500

Area of a tile = 5 x 4 = 20

No. Of tiles = 500/20 = 25

[Jamesbond]

kwcllf:

Jamesbond:

http://i49.tinypic.com/2vb8y2s.jpg\">


Pl help.

Area of floor = 25 x 20 = 500

Area of a tile = 5 x 4 = 20

No. Of tiles = 500/20 = 25

:thankyou:

[Jamesbond]

http://i45.tinypic.com/11cf4uh.jpg\">


Pl help me do (b) question. Is there any strategy for solving such questions.

[mowmow]

Jamesbond:

http://i45.tinypic.com/11cf4uh.jpg\">


Pl help me do (b) question. Is there any strategy for solving such questions.

Fig 1 - 1x1=1
Fig 2 - 2x2=4
Fig 3 - 3x3=9
Fig 4 - 4x4=16
Fig 50 - 50x50=2500

[Laura02]

kwcllf:

Jamesbond:

http://i49.tinypic.com/2vb8y2s.jpg\">


Pl help.

Area of floor = 25 x 20 = 500

Area of a tile = 5 x 4 = 20

No. Of tiles = 500/20 = 25

I think it's

Area of floor = 500 X 400 (cm)

Area of tile = 25 X 20 (cm)

No. Of tiles = 500 X 400
------------
25 X 20
= 400

[Laura02]

No. Of tile = (500 X 400) / (25 X 20) = 400

[Laura02]

mowmow:

Jamesbond:

http://i45.tinypic.com/11cf4uh.jpg\">


Pl help me do (b) question. Is there any strategy for solving such questions.

Fig 1 - 1x1=1
Fig 2 - 2x2=4
Fig 3 - 3x3=9
Fig 4 - 4x4=16
Fig 50 - 50x50=2500

I thought
Fig 1 - 1 tile
Fig 2 - 1 + 3 = 4
Fig 3 - 1 + 3 + 5 = 9
Fig 4 - 1 + 3 + 5 + 7 = 16
Fig 5 - 1 + 3 + 5 + 7 + 9 = 25

But I like MowMow's method more