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Use Ming and Keenya's table to answer Questions 20–22. Write a number sentence showing how you found each estimate.
- Estimate the number of acres of national park land in Colorado.
- Which state, Arizona or Colorado, has more national park land? Estimate the difference.
- Mammoth Cave is the longest known cave network in the world. Estimate the difference in size between Mammoth Cave National Park and Wind Cave National Park.
Raising Money
The Parent-Teacher Club at Bessie Coleman School wants to purchase computers for the school over a two-year period. The club's goal is to purchase computer equipment for 25 stations. Club members made a table to show what they wanted to buy:
Check-In: Question 23
- Use estimation to set a goal for the amount of money the Parent-Teacher Club needs to earn. Write a paragraph explaining how you arrived at your estimate. Use the Math Practices page in the Reference section to help you write your paragraph.