What even is American Grade 1 Maths?
- Thread starter BallistixOnZ490
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The missus is maths lead at her primary and she says differently.
And this is why kids leave school lacking basic numeracy and literacy skills.
I don't believe you.
If we were sitting in a pub and out of the blue you said to me "what's seven plus eight?", I'd just reply "fifteen". I have no idea what process is going through in my head, I'd just know the answer.
I am a maths teacher and yes this is taught. It is the same as your method, just worded differently and is very effective
OK no problem
36+75
87+698
365+12
Just as the bigger numbers will make it less instant light bulb
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Effective at making kids dumber that is.
We were simply given sheets of 20 or so sums to solve almost every day, worked much better.
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Speak for yourself
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40+80 = 120.
- 4 = 116
- 5 = 111.
Do the same for the rest e.g. 90+700.
This absolutely is what you call rounding up, you just subtract what you rounded to after.
If the last digit in the number is under 5 then do the opposite with rounding down.
This isnt difficult, and the method in the OP makes it harder.
Soldato
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I work through (this makes it sound far more taxing than it is
) the same 'make ten' style process but not necessarily always to a ten, just to an easier number sometimes.36+75 to 31+80, then 11+100.
87+698 to 85+700
365+12 to 375+2
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This too, so 6+7 becomes (6x2) + 1.
I work through (this makes it sound far more taxing than it is
36+75 to 31+80, then 11+100.
87+698 to 85+700
365+12 to 375+2
Exactly!
This is just teaching that skill to someone who has no concept of it.
These methods are like tools in your tool box, you could have a hand drill 75+1+1+1+1+1+1....
Or a power tool 31+ 80 +(11+100)
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On this note I had a mental case once that underpaid me by a bit over £2, and didn't understand 'The total bill is £35.xx, you've only given me £33' and he proceeded to have a mental fruitcake strop every time I explained it.
The lady behind him had to intervene, take a £2 coin out of his hand and give it to me, and told him 'Don't worry, you need to give him this and he will give you change'.
Totally valid too, you had your times tables drummed into you so 2x8 (also as we're all computer nerds so know the 8 series well) is a super easy answer for you.
Harder when you don't know what 8x2 is though
I amazed anyone can remember what they were taught in primary school. I can't, that's for sure.
So you see here you've made up imaginary extra numbers/objects very easy for us as adults as a concept to grasp.
But this is a 5 year old so they're still at the 1 have 8 beans 36 add 75 more beans how many do I have.
The idea to invent some new beans then remove them later is a bit too far along the chain.
It will be met with endless "but where did the 4 come from!!!?!?!"
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Its teaching the skill in a far more complex manner than it needs to be making something extremely simple far more difficult to understand.
I remember one of my maths teachers simply said 'Multiplying by 5 is easy, everyone can multiply by 5 in their heads', and then went around the class asking. He pocked me and gave me something such as '5x36'. I had absolutely no clue. He threw his pen at the board over how dumb I was.
It then sank in over the next 10 minutes that all I needed to do is (36x10) / 2, too late as everyone in the class already thought I was an idiot. Everyone else in the class could already do it, just not me.
Any kid that couldn't understand that is also not going to understand making 10s and addend.
Soldato
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i do this all the time when doing mental arithmetic and i still hadn't a bloody clue what the question was asking!
i guess it's just the way it's worded, if you'd been taught to understand that's what the wording wants you to do then it's not too big a deal.
for example using tefal's examples my thought process goes:
ofc the more complex it gets you need to store more numbers in your head which for me at least means i forget (can i buy more ram for my brain?)
so then you start writing things down, or in the modern world just grab a calculator.