Lesson 16 Add Three Numbers
Let’s add 3 numbers.
Warm-up Number Talk: Related Expressions
Find the value of each expression mentally.
Activity 1 Match Expressions
Draw a line to match expressions with the same value.
expressions with 3 numbers
If you have time… Write another expression with 3 numbers. 2 of the numbers should make 10.
Ask your partner to think of the matching
Activity 2 Is the Equation True?
Determine whether each equation is true or false.
Be ready to explain your reasoning in a way that others will understand.
If you have time…
Make any false equations true.
Write 1 equation that is true and 1 that is false.
Switch with your partner.
Activity 3 Write Expressions
If you have time… Write as many expressions as you can with 3 numbers that are equal to
Select 3 expressions that are equal to