# Section A: Practice Problems Add Without Making a Ten

## Section Summary

Details

We added numbers within 100. We learned different methods to add by thinking about tens and ones and record our thinking with equations.

Add tens and tens and ones and ones:

## Problem 1 (Pre-Unit)

How many do you see?

## Problem 2 (Pre-Unit)

There are 9 ducks in the pond.
There are 7 ducks on the grass.
How many ducks are on the pond and in the grass?
Show your thinking using drawings, numbers, or words.

## Problem 3 (Pre-Unit)

Find the number that makes each equation true.

## Problem 4 (Lesson 1)

Find the value of each sum.
Show your thinking using drawings, numbers, or words.

## Problem 5 (Lesson 2)

Find the value of .
Show your thinking using drawings, numbers, or words.

## Problem 6 (Lesson 3)

1. Find the value of
Show your thinking using drawings, numbers, words, or equations.

2. Can you find the value in a different way?

## Problem 7 (Exploration)

1. Find different ways you can use 2 two-digit numbers to make 86.
Use the drawing or connecting cubes, if they are helpful.