Unit 11 Contents

26. Ana has $15 left in her budget to spend. Students need 150 folders. Does Ana have enough money to order all the folders? Explain your reasoning.
27. Ana knows the price of poster paper is usually between 80¢ and 90¢ per sheet. About how much will 35 sheets of poster paper cost?

Multiplying Using a Doubling Table

In Phil and Howard's Excellent Egyptian Adventure story, Ka used a doubling table to solve the problem 21 14.

28. Use Ka's strategy to solve the following problems. Find an estimate to check for reasonableness. Show your thinking. You do not need to use Egyptian numbers.
1. 25 5
2. 25 8
3. 25 11
4. 25 15
5. 25 22
29. There are 14 boats that carry 42 spice boxes each. How many spice boxes are on the boats altogether?