Texas Essential Knowledge and Skills LESSON • Rectangular Prisms (3.8) describe and compare 71 three-dimensional figures by their attributes using formal vocabulary (3.9)(A) identify congruent two-dimensional figures (3.14)(A) identify the mathematics in everyday situations (3.14)(D) use tools such as real objects to solve problems Power Up facts Power Up 71 jump Count up by 25s from 0 to 250. start Count up by 7s from 0 to 77. It is 5:05 in the morning. Draw hands on your clock to show the time in 15 minutes.
Write the time on a digital clock. The temperature in a restaurant kitchen was 28°C. It was 9 degrees cooler in the dining room. Mark your thermometer to show the temperature in the dining room.
Number Sense: 35 + 9 44 math b. Time: 45 minutes + 15 minutes 60 min d. Fractions: What fraction of the marbles are white? 36 or 12 problem Quinh plans to watch his favorite solving television show tonight. He told his mother that the show will begin in 14 minutes and will be over in 74 minutes.
How long is Quinh’s favorite television show? 60 min or 1 hr New Concept Boxes come in different sizes and can be made of different materials. However, most boxes are alike in many ways. In this lesson we will study the shape of rectangular boxes. The shape of a rectangular box is called a rectangular prism or rectangular solid.
Lesson 71 385 Rectangular prisms have flat sides shaped like rectangles. These flat surfaces are called faces. Two faces meet at an edge. Three faces meet at a point.
These corner points are called vertices. Each corner point is a vertex. ,iVÌ>}Õ>ÀÊ*ÀÃ `}i >Vi 6iÀÌiÝ Some of the edges of a rectangular prism are parallel and some edges are perpendicular. PARALLEL EDGES PERPENDICULAR EDGES If we draw a “transparent” rectangular prism, we can see all the faces, edges, and vertices.
First, we draw two overlapping rectangles that are congruent. Then we connect the four vertices of one rectangle to the matching vertices of the other rectangle. Represent Practice drawing a rectangular prism. See student work.
Example 1 How many faces does a box have? Place a box in front of you. See that it has a front and a back, a top and a bottom, and a left side and a right side. A box has six faces. 386 Saxon Math Intermediate 3 Example 2 Compare these two boxes.
Describe how they are alike and how they are different. Both boxes are rectangular prisms. They each have 6 faces, 12 edges, and 8 vertices. Both boxes have rectangular faces.
The boxes are different because the faces of the box on the left are longer than they are wide. The faces of the box on the right are all squares. If every face of a rectangular prism is ÕLi a square, then the figure is a cube. The box on the right in example 2 is a cube.
All the edges of a cube are the same length. Draw a picture of a transparent box. How many vertices does a box have? 8 vertices c. How many edges does a box have? 12 edges d.
sample: A cube is a rectangular prism with square faces. Distributed and Integrated Written Practice 1. Formulate Molly counted the cars as the train rolled by the (20, 28) intersection. There were 103 cars, counting four engines and the caboose.
How many cars were there not counting the engines and caboose? Write a number sentence. Then write your answer in a complete sentence. 103 − 5 = ; sample: There were 98 cars. Hawkins bought two round-trip train tickets to Grant’s Pass for (22) $9.
What was the cost for both tickets? $19. Hawkins paid for the two tickets in problem 2 with a $20 bill. How (26) much money should he get back? 50¢ Lesson 71 387 4. Multiple Choice Which picture below shows the mixed (46) number 145? D A B C D 5.
It is morning. The clock shows the time the train arrived (38) £Ó £ ££ in Chicago. Write the time in digital form. Are the rails of train tracks parallel or perpendicular? n { (Inv.
The distance from the Upland Station to Burns Crossing is 1710 (46) 3 miles. Use words to name 1710. seventeen and three tenths 8. Find each product.
Find each product. Find each product. Represent Follow the directions in this lesson to draw a (71) rectangular prism. A rectangular prism has how many faces? 6 (71) 13.
Use your inch ruler to find the length of the sides of the (35, 69) right triangle. side AB 34 in. side BC 1 in. side CA 114 in.
388 Saxon Math Intermediate 3 14. Represent On your paper draw a triangle congruent to the (68, 69) triangle in problem 13. See student work. Multiple Choice Which polygon shows a line of symmetry? C (Inv.
Martin has three quarters in his pocket. What fraction of a dollar is (29) three quarters? 34 17. If every face of a rectangular prism is a square, then (71) what is the name of the solid? cube 18. Which number on the number line does point M represent? 128 (33) - Early Mr.
Tuff is making a rectangular table that is 4 feet long and 3 feet Finishers : wide. Draw the table using the scale 21 inch = 1 foot. See student work. Real-World Connection Lesson 71 389 Texas Essential Knowledge and Skills LESSON • Counting Cubes (3.11)(F) use concrete models that 72 approximate cubic units to determine the volume of a given container or other figure (3.15)(A) explain observations using objects Power Up facts Power Up 72 jump Count up by 11s from 0 to 110.
start Count up by 5s from 3 to 53. Write 10,550 as words. ten thousand, five hundred fifty Draw an isosceles triangle. Trace the sides that have equal length with a crayon.
See student work. Number Sense: Compare these numbers using the math symbol <, >, or = 2,560 < 2,690 b. Time: It is afternoon. Marta went £Ó £ ££ to the library at the time shown £ä Ó on the clock.
She left 1 hour Î later. What time did she leave the n { Ç x library? 1:15 p. È problem A sheet of paper is folded in half and solving then cut with scissors as shown. How many pieces of paper will there be FOLD after the cut? 3 pieces FOLD CUT 390 Saxon Math Intermediate 3 New Concept Andre uses a forklift to load boxes into a boxcar.
Look at this stack of boxes. Can you count the number of boxes in the stack? We cannot see all the boxes in the stack. One way to find the total is to first find the number of boxes in each layer. Looking at the top of the stack, we see that there are nine boxes in the top layer.
Looking at the side, we see that there are three layers of boxes. To find the total number of boxes, we can add: 9 + 9 + 9 = 27. We can also multiply: 3 × 9 = 27. Formulate If we add two more layers of boxes to the stack, how many boxes will we have altogether? Write a multiplication fact to show the answer.
5 × 9 = 45 Activity Counting Cubes Use cubes to build the stacks of cubes shown on Lesson Activity 27. Answer these questions for each stack of cubes. • How many cubes are in one layer? • How many layers are there? • How many cubes are there in all? Example 1 The picture shows a stack of cubes. How many cubes are in each layer? b.
How many layers are there? c. How many cubes are there in all? a. There are 12 cubes in each layer. There are three layers.
Three layers with 12 cubes in each layer means there are 36 cubes in all. 12 + 12 + 12 = 36 or 3 × 12 = 36 Lesson Practice A box is filled with cubes, as shown at right. How many cubes are in each layer? 10 cubes b. How many layers are there? 3 layers c.
How many cubes are there? 30 cubes Distributed and Integrated Written Practice 1. Sidney was on a 480-mile trip. When the train stopped in Omaha, (20) Sidney had traveled 256 miles. How much farther did Sidney have to travel? 224 miles 2.
Formulate It is 185 miles from Elam to Junction City. How far is (18) it from Elam to Junction City and back? Write a number sentence. Livestock were hauled east from Denver, Colorado, to Chicago, (Inv. Use the scale and your ruler to find the approximate distance from Denver to Chicago.
1,000 mi $ENVER #HICAGO INCH ä MILES 4. It is morning in Chicago. Write the time shown at right in ££ £Ó £ (38) digital form. Find each product.
You may use the multiplication table. Find each product. Find each product. 6 × 7 42 392 Saxon Math Intermediate 3 8.
Find each product. Represent In Lesson 71 we learned how to draw a rectangular 9. Use the same process to draw a cube. (Hint: Begin by drawing two overlapping squares.
What is the shape of every face of a cube? square (71) 11. A rectangular prism has how many edges? 12 (71) 12. Multiple Choice Which polygon does not show a line of symmetry? D (Inv. Harold put some small cubes together to make this larger (72) cube.
How many small cubes make the larger cube? 8 cubes Use polygon ABCD and a ruler to answer problems 14–16. How long is each side of the polygon? 1 in. What is the perimeter of the polygon? 4 in. What is the shape of the polygon? parallelogram (66) # " 16.
Which two angles are obtuse? angles B and D (65, 66) b. Which two angles are acute? angles A and C 17. Conclude The numbers below make a pattern on a multiplication (55, 61) table. What are the next three numbers in this pattern? 36, 49, 64 0, 1, 4, 9, 16, 25, , , ,.
A driveway is 10 yd long and 7 yd wide. What is the (62, 63) area of the driveway? 70 sq. yd YD Lesson 72 393 Texas Essential Knowledge and Skills LESSON • Volume (3.11)(F) use concrete models that 73 approximate cubic units to determine the volume of a given container or other figure (3.14)(D) use tools such as technology to solve problems (3.15)(A) explain observations using objects Power Up facts Power Up 73 jump Count up by halves from 5 to 10. start Count up by fourths from 2 to 4.
Write two multiplication facts using the numbers 9, 7, and 63. 9 × 7 = 63; 7 × 9 = 63 Write these money amounts in order from least to greatest. Number Sense: 38 + 8 46 math b. Measurement: What is the perimeter of the triangle? 12 in.
Geometry: What type of triangle is shown in problem c? equilateral 4 in. problem Denair wrote an addition problem and then erased 2 12 +1 + 15 solving some of the digits. Find the missing digits in the 27 problem. 27 New Concept One way to describe the size of a box is to say how much space there is inside the box.
If we fill up the box with cubes we can describe the space inside the box in cubic units. Instead of saying how many raisins or apples or oranges a SaxonMath.com/ Int3Activities box can hold, we might say how many cubic inches it can for a calculator hold. We might describe the size of a boxcar by saying how activity. many cubic feet or cubic yards it can hold.