Answer: 145,998, 7,000, and 25,991
My guess :))
Step-by-step explanation:
145,998  7,002  4,506  26,991   12,497
<u>First, Mike rounded his number to the nearest ten</u>
146,000  7,000  4,510   27,000   12,500
<u>Then, he rounded his number to the nearest hundred.</u>
146,000  7,000  4,500  27,000   12,500
<u>Last, he rounded his number to the nearest thousand.</u>
146,000  7,000  5,000  27,000   12,000