Vocabulary
What do we call the answer to an addition problem?
Sum
Ms. Paddon has 9 pencils and Mr. Rodriguez has 8 pencils. How many pencils do they have in total?
9 + 8 = 17
10 + 8 = ___
20 - 19 = ___
1
There are 14 apples in a basket. Some are green, some are red. There is an equal number of red apples and green apples. How many are there of each color?
*Remember your doubles facts
There are 7 red apples and 7 green apples.
7 + 7 = 14
Is "In total" a key word for addition or subtraction?
Addition
Mr. Byrant creates 5 math problems. Ms. Sara creates 9 math problems. How many math problems do they create in all?
14 math problems
8 + 6 = ___
14
17 - 13 = ____
4
Show 2 ways to jump on the number line to solve the equation 15 - 8.
Count On: Start at 15, jump back 8.
Count the Difference: Circle 15 and 8, count the jumps in between.
What do we call the numbers being added together in an addition equation?
Addends
What is the difference between 8 and 5?
3
2 + 14= ___
16
19 - 8= ___
11
Ms. Pinto ordered 2 pizzas. Each pizza has 8 slices.
Then, the teachers ate 10 slices of pizza, how many slices are left over?
2 pizzas has 16 slices, 8 + 8 = 16
There are 6 slices left, 16 - 10 = 6
Is "how many more" a math action word for addition or subtraction?
Subtraction
Mr. Aden has 20 plants inside his house. He puts 15 of the plants outside. How many plants are left inside the house?
5 plants
4 + 6 = ___
10
17 - 8 = ___
9
There were 10 cookies on the tray. The kids ate 3.
Then the cafeteria make 10 more cookies.
How many cookies are there now?
10 - 3 = 7
7 + 10 = 17
In the subtraction equation 10 - 4 = 6, which number is the subtrahend, the difference, and the minuend?
10 - 4 = 6
Minuend: 10, Subtrahend: 4, Difference: 6
Ms. Lebron and Mr. Liang have 12 pencils altogether. Mr. Simpson has 16 pencils. How many more pencils does Mr. Simpson have?
4
7 + 5 = ___
12
14 - 8 = ___
6
How can you make a 10 to solve 12 - 4?
Break 4 apart into 2 and 2.
12 - 2 = 10
10 - 2 = 8