Explain how to estimate 368+231 in two different ways.

Greetings!

"Explain how to estimate 368+231 in two different ways."...

1) Add the numbers in the hundreds place and tens value together:
3+2=5
6+3=9
Roughly 590

2) Round the numbers to the nearest tenth place value:
368--->370
231--->230

Now add the numbers together:
37+23
=60
=600
Roughly 600

The actual answer is 599, so both techniques were pretty accurate.

Hope this helps.
-Benjamin