[SoothingDave]

Yeah, I would round both of those up. 400 + 300 = 700

Yep, when you throw the numbers into a calculator and slip a digit you should have some idea when the number is wildly off.

Estimation has its places, but it seems to be given way too much emphasis.

[BikerJoe]

Estimation has its places, but it seems to be given way too much emphasis.

I'm actually glad to see them trying to get kids thinking about whether they did it correctly. LONG before Common Core, I'd sit in reviews where engineers had stuff going faster than light or something, and I was able to see the problem just because the order of magnitude was wrong, but for some reason, they'd never see it.

There are lots of reasons to hate Common Core, but I'm not sure this is one of them.

[IYAS9YAS]

Estimation has its places, but it seems to be given way too much emphasis.

Ayup. Works for me at the checkout counter. Just last night, in fact, I was charged twice for something that was $6.94, and not for the item that was $0.94. I had a rough idea in my head how much my 5 items should have cost, so when it was so much higher, I asked.