Cogito
Grade 1 Math · Chapter 6 · Lesson 7
Sorting and Showing Data
Put things into groups and build a graph.
10 problems · about 12 minutes · 1.MD.C.4
What this lesson teaches
The child sorts items into up to three categories and builds a picture graph.
- Sorting puts things into groups.
- A graph gives each thing one square.
- Taller means more.
Warm-Up Review
From earlier lessons. Loosen up before the new work.
7 problemsReview — How Much Longer?: A 9-cube stick and a 4-cube stick. How much longer is the first?
Answer 5
Why 9 − 4 = 5.
Review — Why Same-Size Units?: Why must you say which unit you used?
Answer Because a number alone does not say how long.
Why 8 cubes and 8 blocks are different lengths, so the unit matters.
Review — Measuring With Cubes: A stick takes 6 cubes laid end to end. How long is it?
Answer 6 cubes
Why 6 cubes long.
Review — Putting Three in Order: Ropes are 3, 9 and 6 cubes. How long is the longest?
Answer 9
Why 9 is the longest.
Review — Using a Third Thing: A rope is shorter than a string. The string is shorter than a pole. Is the rope shorter than the pole?
Answer Yes.
Why Rope is under string, string is under pole, so rope is under pole.
Review — Longer Than, Shorter Than: Why must you line up one end before comparing?
Answer Otherwise you cannot tell which is longer.
Why Lining up the ends is what makes the comparison fair.
Review — True or False to Twenty: Is 13 − 9 = 2 + 2 true?
Answer True. Both are 4.
Why Both sides come to 4.
Warm Up
Straightforward practice. Get the method working first.
2 problemsA graph shows 4 apples and 6 stars. How many in all?
Answer 10
Why 4 + 6 = 10.
On a picture graph, what does a taller column mean?
Answer That group has more.
Why Taller means more things, not bigger things.
Stretch Yourself
Mixed problems. Work out what kind of question it is before you start.
1 problemThe Fruit Bowl: A graph shows 5 apples and 3 stars. How many things in all?
Answer 8 things
Why 5 + 3 = 8.