HELP PLEASE Dividing with remainders

[uselessatmathmum]

Oh my I am useless at math.
Year 7 home work
The octopus is 2000 years old , only 7 of his legs give the correct answer, the numbers on his joints are applied his age (lost me already)

EXAMPLE: LEG ONE: 2000 DIVIDED BY 0.1 X3.7 + 74000 this is correct

A.Use the estimation to decide which leg has the false answer and show your workings

B. What is the correct answer for the leg with the false answer.

Leg 2 ] 2000 x0.2 divided by 0.1 = 4000
Leg 3 ] 2000 divided 0.2 x50 = 500 000
Leg 4 ] 2000 divided 0.3 x30 =200 000
Leg 5 ] 2000 x0.4 divided 1.6 =500
Leg 6 ] 2000 x 07 divided by 0.2 = 700
Leg 7 ] 2000 divided by 0.4 x6.1 = 30 500

Ok PLEEEEEAAAAASSSSSEEEEEEE help.

SORRY LEG 6] SHOULD SAY 2000 X0.7 DIVIDED BY 0.2 = 70

are there any brackets to show which sums should be done first?

EXAMPLE: LEG ONE: 2000 DIVIDED BY 0.1 X3.7 + 74000 this is correct

well 2000/0.1 = 20,000
20,000x3.7 = 74,000
correct

A.Use the estimation to decide which leg has the false answer and show your workings

B. What is the correct answer for the leg with the false answer.

Leg 2 ] 2000 x0.2 divided by 0.1 = 4000
2000x0.2 = 400
400/0.1 = 4000
correct
and just continue

don't understand why you're calling it 'dividing with remainders' though

No, no brackets.
We think it is leg six that is wrong, it should be 7000, DS1 says its something about when you time 0. something it is the same as dividing.
I can't say this is wrong or right, I am hopeless.

Multiplying by 0.1 is equivalent to dividing by 10.

And vice versa.

Yes he's right. So x 0.1 is the same as /10. Likewise /0.1 is the same as x 10.

Do you get a picture of this octopus?

So 2000 x 0.2

= 2000 / 5

= 400

400 / 0.1

= 400 x 10

= 4000

This is tricky unless you know whether the school uses BODMAS (evaluate dvision before multiplication) or BOMDAS (the other way round). Most use BODMAS, I understand, so on that basis...

Leg 2 ] 2000 x0.2 divided by 0.1 = 4000

2000 x (0.2/0.1) = 2000 x 2 = 4000

Leg 3 ] 2000 divided 0.2 x50 = 500 000

(2000/0.2) x 50 = 10000 x 50 = 500000

Leg 4 ] 2000 divided 0.3 x30 =200 000

(2000/0.3) x 30 = (2000/0.1) x 10 = 200000

Leg 5 ] 2000 x0.4 divided 1.6 =500

2000 x (0.4/1.6) = 2000 x (1/4) = 500

Leg 6 ] 2000 x 07 divided by 0.2 = 700

2000 x (0.7/0.2) = 2000 x 3.5 = 7000

Leg 7 ] 2000 divided by 0.4 x6.1 = 30 500

(2000/0.4) x 6.1 = 5000 x 6.1 = 30500

Not sure what part A means; using "the estimation" ??

But maybe they want something along the lines of...

Leg 6 is clearly the wrong one because you are multiplying and dividing by numbers of the same order of magnitude (0.7 and 0.2).
Therefore the answer should be of the same order of magnitude as the number you started with (2000), and is clearly NOT 70.

You already have the answer to part B (7000).

hth but sorry if I've missed the point; as I say, not really sure what they're after with part A.

Sorry many people answered while I was typing. Must speed up

For the estimations (with working), do they mean rounding to the nearest whole number and then working out?

What is the octopus thing all about anyway?

Wow you are all so smart.
Thank you all so much,

I have no idea about the octopus there is a drawing of an octopus with its legs made out of numbers, all very strange.