Maths question help please

1102ha11

the area of the pentagon is 8.56cm2
change 8.56cm2 to mm2

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Reply 1

username2345291

If 1cm=10mm then 1cm² = 100mm².
8.56cm² = 856mm².

Reply 2

1102ha11

Original post by bfm.mcdermott

If 1cm=10mm then 1cm² = 100mm².
8.56cm² = 856mm².

Thank you. Is it alright if I ask for more questions like this

Original post by bfm.mcdermott

If 1cm=10mm ..

Please do not post full solutions it is against the rules

Reply 5

Muttley79

Original post by 1102ha11

Use the idea you were given and post what you get - we don't do questions for people :smile:

Reply 6

username2345291

Original post by Muttley79

Please do not post full solutions it is against the rules

Oh, sorry.

Original post by 1102ha11

No. I've shown you how the conversion works. I won't do your homework for you. It's better for you to practise them yourself - me doing it won't help your education.
To go from mm^2 to cm^2, just do the opposite to what I did to go from cm^2 to mm^2.

Conversion values are just something you need to learn for exams.

Reply 7

1102ha11

Original post by bfm.mcdermott

I’m trying but I don’t get it at all😭 also it’s not homework it’s just me practicing for my exams

(edited 5 years ago)

Reply 8

username2345291

Original post by 1102ha11

I’m trying but I don’t get it at all😭 also it’s not homework it’s just me practicing for my exams

If you're practising for exams, then me just giving you answers won't help at all.

Which question are you on now? I'll try and talk you through it so you can answer it yourself.

Reply 9

1102ha11

Original post by bfm.mcdermott

If you're practising for exams, then me just giving you answers won't help at all.

Which question are you on now? I'll try and talk you through it so you can answer it yourself.

The third one. Would I divide 6900mm2 by 1000 to get cm2?

Reply 10

Muttley79

Original post by 1102ha11

I’m trying but I don’t get it at all😭 also it’s not homework it’s just me practicing for my exams

Think about what was posted - imagine a square 1 cm by 1 cm
It's area is 1 cm^2

Now if we convert the lengths into mm the square is 10 mm by 10 mm so it's area is ....

I recommend doing these questions like this [referring to lengths] rather than trying to remember conversion for areas/volumes

Reply 11

1102ha11

Original post by Muttley79

10mm by 10mm would give an area of 10mm^2?

Reply 12

Muttley79

Original post by 1102ha11

10mm by 10mm would give an area of 10mm^2?

No - how do we get area?

Reply 13

1102ha11

Original post by Muttley79

No - how do we get area?

L X W

Reply 14

MarshallOs

i will help you instead

Reply 15

Muttley79

Original post by 1102ha11

L X W

yes so for a 10mm by 10 mm square the area is

Reply 16

username2345291

Original post by 1102ha11

The third one. Would I divide 6900mm2 by 1000 to get cm2?

How did you get 1000?

mm -> cm is divide by 10.
so mm² -> cm² is divide by 10²

What is 10²?

Reply 17

1102ha11

Original post by Muttley79

yes so for a 10mm by 10 mm square the area is

100

Reply 18

1102ha11

Original post by bfm.mcdermott

How did you get 1000?

mm -> cm is divide by 10.
so mm² -> cm² is divide by 10²

What is 10²?

Oh so the answer is 690cm^2?

Reply 19

MarshallOs

use this method.
to get from mm to cm you divide by 10
to get from mm^2 to cm^2 you divide by 10^2 [i.e 100]
to get from cm to mm you multiply by 10
to get from cm^2 to mm^2 you multiply by 10^2

to get from cm^3 to mm^3 you multiply by 10^3

maths is very logical.
BTW in exams sometimes they might ask you to go from mm^3 to m^3
So divide by 10^3 to get cm^3, then divide by 100^3 to get to m^3

please someone check this

hope this helped