Samuel’s mother gave him coloring pencils for his birthday. He lost forty-three of
them at the park. If he has forty left, write and solve an equation to find how many coloring
pencils Samuel’s mother gave him.
Samuel would have the original amount that he received for his birthday, and then
we would have to take away the number that he lost at the park, and then that would be equal to
the number of pencils that he actually has left. So the original amount we don’t actually know.
Let’s call that 𝑥.
He lost forty-three of them at the park, so let’s take away forty-three. Now that we’ve subtracted forty-three, it should be equal to the number of pencils
that are left, and he has forty left. So 𝑥 minus forty-three equals forty.
Let’s go ahead and solve for 𝑥. To solve for 𝑥, we need to add forty-three to both
sides of the equation. On the left, the forty-threes cancel. And on the right, forty plus forty-three is
This means Samuel’s mother gave him eighty-three coloring pencils for his
birthday. Therefore, the equation to represent this would be 𝑥 minus forty-three equals
forty, and 𝑥 is equal to eighty-three.