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Primary 4 | Maths
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katie
Katie

Primary 4 chevron_right Maths chevron_right Singapore

Please help with this question. Many thanks

Date Posted: 1 week ago
Views: 9

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80 is 1 unit
So there is 6 units in total
80×6=480
Ans:480
:)
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Cloe
Cloe's answer
1 answers (A Helpful Person)
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J
J
1 week ago
80cm = 1 rectangle length + 1 rectangle breadth

But notice that 4 rectangle breadths = 1 rectangle length

So 80cm = 4 rectangle breadths + 1 rectane breadth
= 5 rectangle breadths

1 rectangle breadth = 80cm ÷ 5 = 16cm
J
J
1 week ago
So 1 length of rectangle = 16cm x 4 = 64cm

Length of carpet (not rectangle, don't mix up the two)

= Length of 2 rectangles + breadth of 4 rectangles

= 2 x 64cm + 4 x 16cm
= 128cm + 64cm
= 192cm

Perimeter of carpet

= 2 lengths of carpet + 2 breadths of carpet

= 2 x 192cm + 2 x 80cm

= 384cm + 160cm

= 544cm
J
J
1 week ago
Cloe, you have forgotten to add the last part to your 6 units. That last part is actually adding up to 1 rectangle length

So final answer should be 480cm + 64cm = 544cm
katie
Katie
1 week ago
Thank you :)
1 length of rectangle + 1 breadth of rectangle = width of carpet.
1L + 1B = 80cm
From the layout of the carpet, 4 breadths of the rectangle makes up 1 length of the rectangle.
1L = 4B
4B + 1B = 80cm
5B = 80cm
1B = 16cm
12B = Length of carpet.
12B = 16 x 12cm = 192cm
Total perimeter of carpet
= 192 + 192 + 80 + 80
= 544cm
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TIEW KAI JIE NICHOLAS
Tiew Kai Jie Nicholas's answer
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