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Start with two equations that are the same in every way, like this: 2 + 2 = 4 and 2 + 2 = 4 Now, add "4" more to each of the two equations, one at a time, so you'll get 8 in each equation. But do it different ways in each of the two equations. 1.) Add all of the "4" more to the second "2" in the first equation: 2 + 6 = 8 (and 2 + 2 = 4) 2.) Now split up ...

None of the answers so far seem to give a name for the kind of concept in the inquiry. What you're asking is "how to make 8" or more generally "making numbers". See here and here. "Making numbers" is usually taught late kindergarten or early grade 1. In this case, you might ask the school how they teach it and then teach it to your child the same way that ...