Lesson 11 Add to a Teen Number

    • Let’s add to teen numbers.

Warm-up True or False: Teen Numbers

Decide whether each statement is true or false.
Be prepared to explain your reasoning.

Activity 1 Rock Collection

A handful of rocks.

Kiran collects rocks.
So far he has 14 rocks.
He goes on a hike and collects 3 more rocks.
How many rocks does Kiran have?
Show your thinking using drawings, numbers, or words.

Equation:

Activity 2 Write Equations: Adding on to Teen Numbers

Find the number that makes each equation true.
Show your thinking using drawings, numbers, or words.

  1. Two ten frames. top frame, Red, 10. Bottom frame, red, 2. Yellow, 5.

Activity 3 Centers: Choice Time

Choose a center.

Compare

Center. Compare.

Number Puzzles

Center activity. Number Puzzles.

Find the Pair

Center. Find the pair.

Practice Problem

Problem 1

Find the number that makes each equation true.