Maths Question - Teacher incorrect?

[JaneEyre]

Trouble is your are trying to work out how many 875 sq cm shapes you can get regardless of their shape - the question has a specific shape mentioned.

Yes, you are right. I do see the need to draw a diagram for this type of question
Seems that I have been as stupid as wombat1 DD's teacher
Thank you wombat and all of you. It is so great to have the brain working again after years of rusting!

[JaneEyre]

That’s my turn not to agree with my DS’s teacher... or rather my DS’s classmates.
Unfortunately, my DS has these days a substitute teacher who hasn’t a high professionalism . The children have been working in some maths problems for a few days but she didn’t take the time to do her own calculations to know the answers. So, at correcting time, she was going with
- The answer which came up most
- In case of many different answers, she just chose the answer of the child who is supposed to be very bright in maths.

Well, I don’t agree at all with this way of doing things... but at last, here is the simple problem whose answer filled me with consternation :
A recipe for scones uses 350g of flour to make 16 scones.
How many scones could be made with a 5kg bag of flour?
I would be very grateful if you could post your answer and your way of doing it!

[stevew61]

That’s my turn not to agree with my DS’s teacher... or rather my DS’s classmates.
Unfortunately, my DS has these days a substitute teacher who hasn’t a high professionalism . The children have been working in some maths problems for a few days but she didn’t take the time to do her own calculations to know the answers. So, at correcting time, she was going with
- The answer which came up most
- In case of many different answers, she just chose the answer of the child who is supposed to be very bright in maths.

Well, I don’t agree at all with this way of doing things... but at last, here is the simple problem whose answer filled me with consternation :
A recipe for scones uses 350g of flour to make 16 scones.
How many scones could be made with a 5kg bag of flour?
I would be very grateful if you could post your answer and your way of doing it!

Again 'whole units of measure' are required, the recipe requires 350g of flour to make 16 scones, other un-named ingredients are required, so how many whole lots of 350g are there in 5000g.

The glass question involves 'tessellations', how many can fit.

Like the idea of the majority being right, I vote for a flat earth!

[turtleglos]

[quote][A recipe for scones uses 350g of flour to make 16 scones.
How many scones could be made with a 5kg bag of flour?
/quote]
Surely it depends if you have any other ingredients.....
350g into 5000g
350x10=3500
350x4=1400
the answer I got is 14
Is this with the majority?

[999 mum]

the answer I got is 14
Is this with the majority?

Can I disagree?

Shouldn't it be 14 times 16?

[pheasantchick]

350g divaded by 16 = 21.8 g

Therefore, 1 scone needs 21.8 g flour

5k = 5000g 5000g divaded by 21.8 = 229

229 scones

(16 x 14 -= 224 - approx the same answer)

[JaneEyre]

350g divaded by 16 = 21.8 g

Therefore, 1 scone needs 21.8 g flour

5k = 5000g 5000g divaded by 21.8 = 229

229 scones

(16 x 14 -= 224 - approx the same answer)

I do this problem also this way, but keeping all the decimals 350divided by 16 = 21.875... so I get the answer 228 scones and a bit of dough remaining.

But the teacher said the answer should be 224 (apparently, she did have her own answer for that problem, it was for other problems that she took the answers from the children).

So what is the proper answer: 224 or 228?

If it is 224, I don't understand how to do the problem

[999 mum]

If it is 224, I don't understand how to do the problem

A recipe for scones uses 350g of flour to make 16 scones.
How many scones could be made with a 5kg bag of flour?

There are 5000 grams of flour altogether.

350 grams make 16 scones (needed for 1 batch of the recipe)

350g into 5000g
350x10=3500
350x4=1400
the answer I got is 14

So the recipe can be made 14 times (will leave 100 grams of flour - this will not make a complete recipe)

As each recipe makes 16 scones the total number of scones will 14 times 16 = 224

(PS I can see the logic of both answers, it depends on how you read the question)

[guest201]

The question asks for how many scones not how many batches so imo you need to find out how much is needed for each scone then work out how many you can make with 5 kgs of flour.

[chinu888]

from a square 1m by 1m (which is same as 100cm by 100cm) we can ONLY cut 10 full sheets of glass of the dimension (35cm by 25 cm).

this cannot be solved by the usual 10000 / 875= 11.42 ... method . This is wrong as we have to take the dimensions into account. its like fitting a puzzle

we HAVE to draw out sample square .
the 1 side of 100 cm can be marked of into 4 as each 25 cm smaller square will fit into it.
the other 100cm side can be marked of into 2 as only two 35 cm side will fit.
now that completes 8 squares.
now for the left bit we have to change the orientation of the sheet & mark of 2 more squares meauring 25 by 35.
there will be a sheet of 5cm by 100 cm long strip remaining at the end

think of this as a PUZZLE BOARD GAME where u r given a 100 cm by 100cm square & smaller squares of 35 cm by 25 cm square. how can u ft them in? ONLY 10 WILL FIT , 8 squares horizontal & 2 squares vertical