2.6 Geometry, Time, and Money
Unit Goals
 Students reason with shapes and their attributes and partition shapes into equal shares, building a foundation for fractions. They relate halves, fourths, and skipcounting by 5 to tell time, and solve story problems involving the values of coins and dollars.
Section A Goals
 Identify triangles, quadrilaterals, pentagons, hexagons, and cubes.
 Recognize and draw shapes having specified attributes, such as a given number of angles or a given number of equal faces.
Section B Goals
 Partition rectangles and circles into halves, thirds, and fourths and name the pieces.
 Recognize 2 halves, 3 thirds, and 4 fourths as one whole.
 Understand that equal pieces do not need to be the same shape.
Section C Goals
 Tell and write time from analog and digital clocks to the nearest five minutes, using a.m. and p.m.
Section D Goals
 Find the value of a group of bills and coins.
 Use addition and subtraction within 100 to solve one and twostep word problems.
Section A: Attributes of Shapes
Problem 1
Preunit
Practicing Standards: 1.G.A.1
 Draw a rectangle and label it A.
 Draw a triangle and label it B.
Solution
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Problem 2
Preunit
Practicing Standards: 1.G.A.3
 Split the circle into 2 equal parts.
 Split the rectangle into 4 equal parts.
Solution
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Problem 3
Preunit
Practicing Standards: 1.MD.B.3
Write the time each clock shows.
Solution
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Problem 4
Preunit
Practicing Standards: 2.NBT.B.5
Find the value of each expression.
 \(25 + 25 + 10 + 5\)
 \(83  42\)
 \(37 + 54\)
 \(66  49\)
Solution
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Problem 5
Here are some shapes.
 Find a triangle and label it A. Explain why the shape is a triangle.
 Find a pentagon and label it B. Explain why the shape is a pentagon.
Solution
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Problem 6

Diego drew this shape and said that it is a pentagon. Do you agree with Diego? Explain your reasoning.
 Draw a pentagon on the grid.
Solution
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Problem 7
 Draw a quadrilateral that has 3 sides that are 2 inches long.
 Draw a different quadrilateral that has 3 sides that are 2 inches long.
Solution
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Problem 8
This image represents a solid shape. Describe this shape.
Solution
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Problem 9
Exploration
Priya says this shape is a quadrilateral.
Han says this shape is a pentagon.
Who do you agree with?
Explain your reasoning.
Solution
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Problem 10
Exploration

Can you draw a pentagon with 5 square corners? Use the dots if they are helpful.

Elena says this hexagon has 6 square corners. Do you agree with Elena? Explain your reasoning.
Solution
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Section B: Halves, Thirds, and Fourths
Problem 1
Here is a pattern block shape Lin made.
 Describe the blocks Lin used to make her shape.
 Build Lin’s shape using only equalsize shapes.
Solution
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Problem 2

Andre drew this picture and said each part of the square is a fourth. Do you agree with Andre? Explain.

Partition the square into 4 equal parts in a different way.
Solution
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Problem 3
Diego cut a square into two equal pieces and then cut one of the pieces into two equal pieces. He says the shaded part is a third of the square. Do you agree with Diego? Explain your reasoning.
Solution
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Problem 4

Partition the circle into 4 equal parts.

Shade 3 parts blue and one part red.

How much of the circle is shaded?
________________________
Solution
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Problem 5
Exploration
Is the square divided into fourths? Show your reasoning.
Solution
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Problem 6
Exploration
Can you divide the square into equal parts?

4 equal parts with 3 of the parts different shapes

4 equal parts with 4 of the parts different shapes
Solution
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Section C: Time on the Clock
Problem 1
 Write the time shown on the clocks using the words half past, quarter past, or quarter till.

Draw hands on the clock face to show half past 5.
Solution
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Problem 2
Priya says that the clock shows that it's 7:11. Do you agree with Priya? Explain your reasoning.
Solution
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Problem 3

The clock shows when Clare went to bed. Write the time, including a.m. or p.m. ____________________ 
The clock shows when Noah got to school. Write the time, including a.m. or p.m. ____________________
Solution
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Problem 4
Exploration
Mai got to school at 7:35 a.m. She left school to go home 375 minutes later. What time did Mai leave to go home? Explain your reasoning.
Solution
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Problem 5
Exploration
Fill out the table with some of the things you do during the day and the time for each activity.
activity  time 

wake up  
leave for school  
Solution
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Problem 6
Exploration
This clock only has an hour hand.
What can you say about the time shown on the clock?
Solution
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Section D: The Value of Money
Problem 1
 Which coins are shown in the picture?
 What is the value of the coins altogether?
Solution
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Problem 2

Which coins are shown in the picture?

What is the value of the coins altogether?
Solution
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Problem 3
Select 3 collections of coins that show a dollar.
Solution
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Problem 4
Mai has 92 cents. She gives Lin 38 cents. How many cents does Mai have now?
Solution
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Problem 5
Diego's bike cost $55.
That's $27 less than Clare’s bike cost. How many dollars did Clare’s bike cost?
Solution
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Problem 6
Exploration
Lin has 7 coins. The value of the coins altogether is 31 cents.
 What coins could Lin have?
 Can you find more than one possibility?
 Can you find more than two possibilities?
Solution
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Problem 7
Exploration
item  cost (cents) 
notebook  25 
colored pencil  18 
pencil box  39 
glue stick  4 
Jada spent exactly one dollar on school supplies. What could Jada have bought? Find 2 different solutions.
Solution
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