"I'll give you that" and "I'll give you that much" are both trying to say the same thing, but they are idiomatic and each actually mean something completely different. "I'll give you that." means I am giving you an entire unit. "I'll give you that car" "I'll give you that raise you wanted." "I'll give you that much" is expressing a portion or a quantity of something: "I'll give you that much wine" "I'll give you that much bread" These expressions are usually followed by a visual indication of quantity. So, another way to say those two phrases to understand their gist could be: "I'll give you that point" where point is 'a win in an argument' "I'll give you that much consideration" where one gives a greater amount of 'consideration' than they would normally have done.

The word much implies that up to this point is conceded but no more. Not including the word much can at times mean a total concession of all points. There is a difference in some cases. Yet in others they both can be used to mean partial concession. Total concession... "I never thought of it that way. I'll give you that." "It really is too cold for shorts today. I'll give you that one." "I don't like you, but you were right about the train. I will give you that much." Partial Concession... "You are right about the first part. I will give you that much." "I like her, but you are right about her mother. I will give you that." I hope this helps. Mat

you can described with both sentence, "I'll give you that" and "I will give you tht much" but the major difference between the meaning of that two sentence is huge. I'll give you that means u r described abt a complete packet or things without any concession or bargaining... for exam "I will give you that mobile" (a complete unit of that mobile set...) I'll give you that much means U can measured only one particular thing by ur own experience.. For exam,"I will give you tht much amount of water or wine or money etc..."

There really is no difference between the two phrases. Each carries the meaning of conceding a point partially. One would expect a "but" to follow.