# 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 on tens then ones:

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)

Find the value of

Show your thinking using drawings, numbers, words, or equations.Can you find the value in a different way?

## Problem 7 (Exploration)

Find different ways you can use 2 two-digit numbers to make 86.

Use the drawing or connecting cubes, if they are helpful.Can you make 86 by adding a two-digit number to itself?

## Problem 8 (Exploration)

Together Mai and Han have 75 counters.

How many counters could Mai have?

Then how many counters would Han have?

Find at least 5 different solutions.