Lesson 3 Are the Expressions Equal?

    • Let’s think about how expressions can be equal.

Warm-up How Many Do You See: Sums within 10

How many do you see?
How do you see them?

  2. Ten frame. Top, 3 red counters. Bottom, full, yellow counters.
  3. Ten frame. Top, 3 red counters. Bottom, 4 yellow counters.

Activity 1 Sort Addition Expressions

Sort the cards into groups with the same value.

Activity 2 Are Both Sides Equal?

Determine whether each equation is true or false.
Be ready to explain your reasoning in a way that others will understand.

    1. hand with thumbs up and true written underneath.
    2. hand with thumbs down and false written underneath.

    1. hand with thumbs up and true written underneath.
    2. hand with thumbs down and false written underneath.

    1. hand with thumbs up and true written underneath.
    2. hand with thumbs down and false written underneath.

    1. hand with thumbs up and true written underneath.
    2. hand with thumbs down and false written underneath.

    1. hand with thumbs up and true written underneath.
    2. hand with thumbs down and false written underneath.

  6. If you have time… Change the false equations to make them true.

Practice Problem

Problem 1

Select 3 true equations.