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Help! I'm stumped on the Year 4 maths homework

(9 Posts)
MrsFogi Sun 19-Mar-17 15:45:07

and don't want to let on to dd that I don't know how to tackle it. So the question is x+y=67 and x-y=19 what do x and y represent? Can someone explain to me so that I can then pass this off as my own brilliant competence in maths [dies of embarrassment smiley/there is not hope for my children smileys].

PurpleDaisies Sun 19-Mar-17 15:50:02

Add each side of the two equations...
X+Y+x-y =2x
67+19 = 86

So 2x=86, x=43
Then go back to either of the original equations

X + y = 67
43 + y = 67
Y= 24

Ilikesweetpeas Sun 19-Mar-17 15:50:21

Sorry I can't help you but I opened the thread because I'm also stumped by y4 maths homework!! To me the method we need to use four ours is long division but DC is doing some other weird and wonderful method which is getting the wrong answer so they want help! What are we going to do when they get to secondary?! wine

WishITookLifeSeriously Sun 19-Mar-17 15:50:59

X=43, y=24.

Polly99 Sun 19-Mar-17 15:51:28

The total of x and y is 67 and x is 19 more than y.
So 67-19 divided by 2 equals y.
X = y + 19.

PurpleDaisies Sun 19-Mar-17 15:57:02

How is the actual homework worded? In year four I wonder if they're just wanting the children to experiment with different ways of working it out rather than solving simultaneous equations.

Astro55 Sun 19-Mar-17 16:50:21

I can explain it I think!

Astro55 Sun 19-Mar-17 16:50:41

DC is doing some other weird and wonderful method. This I mean!!

catkind Sun 19-Mar-17 17:00:49

In year 4 I wonder if they're looking for a trial and error sort of method rather than algebra. So e.g. try x=25 then 25+y=67 so y= 42, oh no x-y is negative. (Or a brighter child would realise to start with x the bigger number.) Okay, so how about if x=42 and y=25, then x-y=17, that's close, but I need x bigger and y smaller. x=43, y=24 - ahah that works!

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