Right, i was given the following problem through society media. Ns am awfully puzzled on what it is asking, and hopefully someone can shed some irradiate on what the truely means.

You are watching: Which is a doubles minus one fact

4.) i m sorry is the doubles minus one truth for 4 + 4? (Lesson 3.5)

4 + 5 = 9

4 + 3 = 7

3 + 5 = 8

4 + 4 = 8

Here is the yes, really picture.

Now, ns think it method 4 + 4 - 1 = 4 + 3 = 7, but I am not sure on why.

You're right. It's a early grade cheat for including numbers. Since it's much less complicated to add doubles (ie 5 + 5), if you have something like 5 + 6, this is the very same as doubling 6 and subtracting 1.

5 + 6 = 6 + 6 - 1 = 12 - 1 = 11.

Wow that's confusing wording but I see what they're trying to say. According to this web page the answer is b. In theory this is great for teaching the "=" is a relationship rather than simply a marking for "answer walk here." The much more general form for this trouble is together follows-

given the sum

a + b = c

assuming that a>b you can define b in regards to a and a constant e together follows

b = a - e

a + a - e = c

and then

2a - e = c

While this seems clunky and also overcomplicated, this form of thinking can assist mental math and also mathematical literacy in general. I don't prefer the idea the labeling it together a "rule" or to teach this specific process as a systems for problems, yet then again I'm no a teacher and I don't understand the mental capabilities the a 2nd grader. To me, the much more general kind makes much more sense however I can see just how that could confuse children.

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