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 Post subject: Maths Question HelpPosted: Tue Oct 26, 2021 1:56 pm

Joined: Fri Oct 18, 2019 5:19 pm
Posts: 62
Please can someone help me with the explanation to this basic maths question?

Quote:
-1 - -5

To me, its should be -6 but the answer in the CGP book is 4

if the question is like that
-1 -(-5) the answer is 4

Please can someone explain me an easier way to explain it to my DS

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 Post subject: Re: Maths Question HelpPosted: Tue Oct 26, 2021 2:26 pm

Joined: Sun Oct 04, 2020 2:15 pm
Posts: 162
Location: Trafford
2 negatives make a positive

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 Post subject: Re: Maths Question HelpPosted: Tue Oct 26, 2021 4:35 pm

Joined: Fri Oct 18, 2019 5:19 pm
Posts: 62
Thanks for your reply.

Any idea how to explain this to a kid.?

I tried using the number line method but still was unable to figure out how to explain this.

Any resource/suggestion will be extremely appreciated.

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 Post subject: Re: Maths Question HelpPosted: Tue Oct 26, 2021 4:48 pm

Joined: Mon Jun 18, 2007 3:32 pm
Posts: 7755
Location: East Kent
2021EnTrY wrote:
Thanks for your reply.

Any idea how to explain this to a kid.?

I tried using the number line method but still was unable to figure out how to explain this.

Any resource/suggestion will be extremely appreciated.

Start at 0 step back 1 to -1. Then “take away” 5 steps, go 5 steps in opposite direction. Where do you end up?

Try it with lots of different numbers.
I find it works to use a counter or similar and get child to physically move it along (or up and down) the number line.

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 Post subject: Re: Maths Question HelpPosted: Tue Oct 26, 2021 6:04 pm

Joined: Wed May 09, 2007 3:09 pm
Posts: 1218
Location: Solihull, West Midlands
The "balloons and sandbags" model can hehlp: positive numbers are like balloons (or puffs of helium) which give "lift", negative numbers are like sandbags which pull you down. Hence removing sandbags ("taking away a negative number") has the same effect as adding more balloons

Just rote learning "two negatives make a positive" is potentially unhelpful without grasping the concepts at an instinctive level

I could only find some American videos describing this :

first addition
https://www.youtube.com/watch?v=2KWGsEU4kDE
then subtraction
https://www.youtube.com/watch?v=8wQkVr6GE-M

There's also an nrich game using the same concept https://nrich.maths.org/9941 and you can download templates to make copies - perfect half-term fun... https://www.tes.com/teaching-resource/a ... e-11679644

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