Also you know, I really do use dh in this because I understand the problems but we both get bogged down in the ways we would approach the problems.
So I try to verbalize it, because that's the way I can make sense of it. So I say 'right, you are going to the toy shop with 50p. It's a very nice coin, and you holding it in your hand all the way there because you don't want to drop it'
and he nods.
Then I say 'they've got a boat for 25p and you think you like it, and then there's a ball for 10p'
and he says 'that's quite cheap isn't it for a ball?'
and I say 'yes, it is. They are on Special Offer'
And he says 'that's lucky'
Then I say 'yes, and um, how much was the boat again?'
and he says 'is it red?'
'Yes, with a green sail. Um ds2, I can't remember how much money you were taking to the shop can you?'
'No, but I didn't want to drop it'
'No you didn't'
At which point ds1 or DH says 'STEP AWAY FROM THE HOMEWORK 100X'
I think I might need to leave this thread now to more helpful less confused people!