Grade 2 | MATHEMATICS
WEEK 10 • STUDENT TEXTBOOK • DAYS 46–50
Read each lesson with a parent or teacher and study the worked example. Then answer the questions for that day in the Week 10 Practice Workbook.
Week 10 Student Textbook | Week 10 Practice Workbook | Week 10 Teacher Guide | Week 9 Student Textbook | Grade 2 index
Day 46: Make a Line Plot from Measurements
A line plot shows measurements on a number line. Draw a line and mark it in whole units, such as 3, 4, 5 and 6 inches. Every length you measured must have a place on the line.
For each object, draw an X above its length. When two objects have the same length, stack the X marks. The tallest stack shows the most common length.
Worked example: Four pencils measure 5, 6, 6 and 7 inches. How many X marks go above 6?
- Find each 6 in the list.
- There are two pencils that are 6 inches.
- Stack 2 X marks above 6.
Worked answer: 2 X marks go above 6.
Day 47: Picture Graphs and Bar Graphs
A picture graph uses pictures to show how many are in each group. A key tells what each picture stands for.
A bar graph uses bars. The height of each bar shows how many. Read the number at the top of the bar on the scale. Both graphs need a title and labels.
Worked example: In a picture graph, the key says each picture stands for 1 child. The Swings row has 5 pictures. How many children chose swings?
- Each picture is 1 child.
- Count the pictures: 5.
Worked answer: 5 children chose swings.
Day 48: Read and Compare Bar Graphs
Bar graphs help us compare. Look for the tallest and shortest bars, then use the scale to find exact numbers.
You can add bars to find a total and subtract bars to find how many more or how many fewer.
Worked example: A bar graph shows 9 red cars and 4 blue cars. How many fewer blue cars are there?
- Read both bars: 9 red and 4 blue.
- Subtract: 9 – 4 = 5.
Worked answer: There are 5 fewer blue cars.
Day 49: Venn Diagrams: Sort and Predict
A Venn diagram uses two circles that overlap. Each circle is a group. Things that belong to both groups go in the middle, where the circles overlap. Things that belong to neither group go outside the circles.
You can use a Venn diagram to make a prediction: decide where a new item should go, then test or check to see if you were right.
Worked example: Circle A is Has Wheels. Circle B is Can Fly. Where does an airplane go?
- An airplane has wheels.
- An airplane can fly.
- It belongs to both groups.
Worked answer: In the middle, where the circles overlap.
Day 50: Independent Check: Data and Graphs
Today you will answer on your own.
Use what you learned this week: read line plots, read bar graphs with the scale, and count every part of a Venn diagram.
Worked example: A line plot has 3 X marks above 7 inches. How many objects are 7 inches long?
- Each X is one object.
- There are 3 X marks.
Worked answer: 3 objects.
Week 10 Student Textbook | Week 10 Practice Workbook | Week 10 Teacher Guide | Week 9 Student Textbook | Grade 2 index
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