Answer:
45,000
Explanation:
when rounding to the nearest thousand, you look at the digit in the hundreds place (2)
5 or bigger means add 1 more thousand and set everything below the thousands digit as zero
else, anything less than 5 means set everything below the thousands digit as zero
2 is in 'anything less than 5' so we clear everything below the thousands digit, which in this case is the '214' in 45,214 --> 45,000