Cogito
Grade 3 Math · Chapter 6 · Lesson 1
Scaled Picture Graphs
When one picture means more than one.
10 problems · about 13 minutes · 3.MD.B.3
What this lesson teaches
The child reads a scaled picture graph where each symbol represents several items.
- One picture can stand for several things.
- The key tells you how many.
- Count the pictures, then multiply.
Warm-Up Review
From earlier lessons. Loosen up before the new work.
3 problemsReview — Fractions of Different Wholes: Two same-size pizzas. Which is more, 3/4 or 1/2?
Answer 3/4
Why 3/4 is greater than 1/2 of the same whole.
Review — Fractions Greater Than One: How many fifths land on the 2?
Answer 10
Why 10/5 = 2.
Review — Equivalent Fractions: How many sixths equal 1/3?
Answer 2
Why 1/3 = 2/6.
Warm Up
Straightforward practice. Get the method working first.
3 problemsEach picture is 5. A column has 8 pictures. How many?
Answer 40
Why The column stands for 40.
What is the first thing to read on a scaled graph?
Answer The key.
Why The key tells you what one symbol stands for.
Each picture is 5. A column has 7 pictures. How many?
Answer 35
Why 7 × 5.
Build It Up
The same ideas with more to keep track of.
1 problemEach picture is 2. A column has 9 pictures. How many?
Answer 18
Why 9 × 2.
Stretch Yourself
Mixed problems. Work out what kind of question it is before you start.
3 problemsEach picture is 10 and the total is 60. How many pictures?
Answer 6
Why 60 ÷ 10.
The Survey: Each picture stands for 10. A column has 3 pictures. How many is that?
Answer 30
Why The column stands for 30.
Two Columns: Each picture is 5. One column has 6 pictures, another has 3. How many more in the first?
Answer 15
Why 30 − 15 = 15.