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Solving Problems with Sums and Differences
- Mrs. Dewey is thinking about buying a telescope for the school. One telescope costs $129.99. Another more expensive model costs $254.09. Estimate the difference between the prices.
- Mrs. Dewey's class wants to buy the telescope that costs $254.09. To raise enough money for it, they hold a bake sale. Each day they make the amount of money shown in the table.
- Show or tell how to estimate the amount of money the class raised.
- Does the class have enough money to buy the telescope?
- If not, estimate how much more money they need to raise.
- Based on the sales from the first five days, how many more days should the class plan to have the bake sale? Explain.
