Estimate the following by rounding each number to hundreds; then divide to get the exact answer. A calculator uses eight circuit boards, each containing 450 parts. A company has 421,215

Estimate the following by rounding each number to hundreds; then divide to get the exact answer.
A calculator uses eight circuit boards, each containing 450 parts. A company has 421,215 parts in stock.
a. How many calculators can it manufacture?
b. How many parts will be left over?

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