Lesson 3 Add Your Way

Warm-up Number Talk: Hundreds, Tens, and Ones

Find the value of each expression mentally.

Find the value of each sum in any way that makes sense to you. Explain or show your reasoning.

Andre found the value of $276 + 118$ . His work is shown.

$200 + 100 = 300$
$70 + 10 = 80$
$6 + 8 = 14$
$300 + 80 + 14 = 394$

Clare found the value of $276 + 118$ . Her work is shown.

$6 + 8 = 14$
$70 + 10 = 80$
$200 + 100 = 300$
$14 + 80 + 300 = 394$

With your partner, discuss:

Find the value of each sum in any way that makes sense to you. Explain or show your reasoning.