Lesson 23 Two-Digit Numbers in Our World
Let’s estimate how many objects are in a group.
Warm-up Estimation Exploration: Beans
How many beans are there?
Record an estimate that is:
too low | about right | too high |
|---|---|---|
Activity 1 Count the Objects
Problem 1
Experiment 1: How many objects are in 2 handfuls?
Record an estimate that is:
too low
about right
too high
Now find the exact number.
Problem 2
Experiment 2: How many objects are in 2 handfuls?
Record an estimate that is:
too low
about right
too high
Now find the exact number.
Problem 3
Experiment 3: How many objects are in 2 handfuls?
Record an estimate that is:
too low
about right
too high
Now find the exact number.
Activity 2 Quantities Card Sort
Estimate and sort the pictures based on the amount of items you see.
Sort into these groups.Less than 20
20 to 50
More than 50
Select 1 picture from each group. Show the number of items you think are in the picture in as many ways as you can.
Less than 20
20 to 50
More than 50