what has happened to it?
how do you undo this process?
3 + 6 = 9 this means that 6 = 9 - 3
[making 6 the subject]
maybe start by saying it out loud
"if 10 divided by 2 is 5, what other statements can I write involving these three numbers"
then try to write these as an expression involving numbers
consider the steps: what happened in going from 3 + 6 = 9 to 6 = 9 - 3 ?
[equivalent statements, obtained by rearrangement]
thanks to John Mason ( e.g. PM649 Supporting Primary Mathematics 1990)
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