The equals sign “=” tells you that things are equal. When you look at an equation, the equals sign says the amount on the left is the same as the amount on the right.

**To better understand intro to equality (finding a missing number)…**

## LET’S BREAK IT DOWN!

### Write an equation to show how many Drums.

You have 3 drums and 5 drums. That’s 8 drums in all. You can write equations to show the number of drums: 3 + 5 = 8 or 8 = 3 + 5. The equal sign means that the amounts on both sides are the same. 8 is equal to 8.

### Write an equation with a missing number.

There are 6 muffins and some more muffins. There are 15 muffins in all. You can use an equation to show how many muffins. 15 = 6 + ? or 6 + ? = 15. The ? shows that there is something you don’t know.

### Write an equation to find the missing number of muffins.

You know that 15 = 6 + ?. What is the missing number? Count on from 6 to 15: 7, 8, 9, 10, 11, 12, 13, 14, 15. You counted on 9 in all. 15 = 6 + 9. The missing number of muffins is 9.

### Write an equation to find how many birds flew away.

A nest has 12 baby birds. You saw some birds fly away. Now there are 5 baby birds in the nest. How many flew away? 12 – ? = 5. You know that 5 + 7 = 12, so the missing number must be 7. 7 birds flew away.

### Party Favors

You won 5 cards and 6 yo-yos. That is 5 + 6 prizes in all. Your friend won 3 cards and 8 yo-yos. That’s 3 + 8 prizes in all. 5 + 6 = 11. 3 + 8 = 11. So, 5 + 6 = 3 + 8. You and your friend won the same number of prizes.

## INTRO TO EQUALITY (FIND A MISSING NUMBER) VOCABULARY

## INTRO TO EQUALITY (FIND A MISSING NUMBER) DISCUSSION QUESTIONS

### Nancy has 6 green apples and 7 red apples. Padma has 9 red apples and 4 green apples. Do Nancy and Padma have the same number of apples? How do you know?

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