
Harvey F. answered 02/25/15
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Hi Kris,
I think your question has two parts.
Part 1: "Round 258 to the highest place value" I think means "Round 258 to its highest place value." If that is correct then the answer is 300 since the hundreds place value is the largest in 258.
Part 2: Estimate to the highest place value: 258+62= 320 which rounds to 300.
I hope this is what you needed.
Kris K.
02/25/15