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Intro to Equality (Find a Missing Number)
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 The equal sign tells us that the amount on both sides of it are the same.
 Understanding the equal sign can help us find a missing number in an equation.
 This knowledge can help us play drums, have a bake sale and even smash open a piñata!

Discussion Questions

Before VideoThere are 3 green balls and 2 blue balls. Use counters to compare the number of balls. Draw a picture.ANSWER

The number of green balls is greater than the number of blue balls (3 > 2), or the number of blue balls is less than the number of green balls (2 < 3).

The number of blue balls is the same as the number of orange balls (6 = 6).

The number of green balls and the number of blue balls is the same (5 = 5)

The number of red balls is greater than the number of yellow balls (9 > 4), or the number of yellow balls is less than the number of red balls (4 < 9).

The number of red balls and the number of blue balls is the same (12 = 12).


After VideoWrite an equation to show that 4 + 9 books are the same as 13 books.ANSWER

4 + 9 = 13.

9, 8 + 9 = 17.

8; 6 = 14 – 8

7; 7 – 3 = 4

Nancy has 6 + 7, or 13 apples. Padma has 9 + 4, or 13 apples. 6 + 7 = 13 and 9 + 4 = 6 + 7 and 13 = 13. Nancy and Padma each have 13 apples.



Vocabulary

Equal sign
DEFINE
Means that the amounts on both sides of it are the same.

Equation
DEFINE
Says that two things are equal. 6 + 3 = 9.

Total
DEFINE
The whole amount.

True equation
DEFINE
Values on each side of the equal sign are the same.

False equation
DEFINE
Values on each side of the equal sign are not the same.

Equal
DEFINE
Exactly the same amount or value.

Unknown Amount
DEFINE
An equation may show that one part is unknown. You may see it as ____ or ?, for example, 3 + ? = 10.

Equal sign
DEFINE

Reading Material
Download as PDF Download PDF View as Separate PageWHAT IS INTRO TO EQUALITY (FIND A MISSING NUMBER)?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)…
WHAT IS INTRO TO EQUALITY (FIND A MISSING NUMBER)?. 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 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 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 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.
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 yoyos. That is 5 + 6 prizes in all. Your friend won 3 cards and 8 yoyos. 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.
Party Favors You won 5 cards and 6 yoyos. That is 5 + 6 prizes in all. Your friend won 3 cards and 8 yoyos. 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. 
Practice Word Problems

Practice Number Problems

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Find the number that makes the equation true. 7 + ? = 14
Find the number that makes the equation true. 2 = 11 – ?
Mateo has 8 small toy cars and 5 big toy cars. Trung has 4 small toy cars and 9 big toy cars. Do Mateo and Trung have the same number of toy cars? Show with equations.
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