# 4.1: Which Boxes

You have lots of these boxes. If you wanted to make the pans balance, which boxes will you put in the empty pan? Can you solve this problem in more than one way?

### Guidance

In order to balance pans like the one above, use the problem solving steps to help you.

- First,
**describe**what you see and what information you are given. - Next, identify what
**your job**is and what you are trying to solve. In all of these problems, your job will be to figure out which boxes to put in the pan. You want to make sure that the pans will balance. - Third, make a
**plan**for how you will solve. - Fourth,
**solve**the problem. - Last,
**check**your answer by making sure that the combinations of boxes you found add up to the amount that you needed.

For the problem above, since the left side weighs 10 pounds, you want to make sure the right side will also weigh 10 pounds.

#### Example A

Put boxes in the empty pan.

Make the pans balance.

Which boxes will you use?

Can you use a different set of boxes? Explain.

**Solution:**

We can use the problem solving steps to help us solve this problem.

#### Example B

Put boxes in the empty pan.

Make the pans balance.

Which boxes will you use?

Can you use a different set of boxes? Explain.

**Solution:**

We can use the problem solving steps to help us solve this problem.

#### Concept Problem Revisited

We can use the problem solving steps to help us solve this problem.

### Vocabulary

To be ** equal** means to be the same. In this concept, we are trying to make weights equal. This means we are trying to make each side of the pan balance have the same weight.

### Guided Practice

For each problem, put boxes in the empty pan to make the pans balance. Can you find more than one answer?

1.

2.

3.

**Answers:**

1.

2.

3.

### Practice

For each problem, put boxes in the empty pan to make the pans balance. Can you find more than one answer?

### Image Attributions

## Description

## Learning Objectives

In this concept, students add whole numbers to determine which boxes should be placed in the empty pan of a two-pan balance in order to balance the pan. Students will use problem solving steps to help them.