- Thread starter Divad2017
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I'm not sure what could be "easier" than "plug the number in for the letter, and simplify"...? :shock:Divad2017 said:Can you help me describe this to my son in easier terms and how to do it? How is the work done to arrive at the answer?

Since we can't teach lessons here anyway, try looking for online lessons that work better for you:

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Have fun!

Eliz.

125 - x + 13 is your original expression.

For x, substitute 43:

125 - (43) + 13

And simplify: 125 - 43 + 13 = 95

Perform similar steps in your second example to arrive at 200 + 32 times 20 = 840

Would it help to

I might suggest that at some later time he will be introduced to negative numbers in which case you always want to include the sign with the number by enclosing in parenthesis. In other words, if x=-43, the expression would become 125 - (-43) + 13. But, save that for the future.