Addition Equations
8+6=?
14
9-4=?
5
Zero property of addition
8+0=?
Nothing is added so the answer is 8
Rule for Zero
8-0=?
Nothing is taken away so the number doesn't change. 8-0=8
How many tickets to ride one ride and play one game?
6+8=14
11+7=?
18
17-8=?
9
The Commutative Property of addition
5+3=? or 3+5=?
both equal 8; commutative means they can move positions and it doesn't change the answer
Counting back in subtraction
10-4=?
Start at the bigger number and count back to smaller number keeping track of how many you count.
Use a number line to help. 10-4=6
Day at the Fair: Face painting - 7 tickets, Cotton Candy - 3 tickets
How many tickets to get your face painted and eat cotton candy?
7+3=10
18+5=?
28-3=?
25
6 + 6= ?
Adding a number to itself doubles it
6+6=12
Counting up in subtraction
12-8=?
Start at the smaller number and count up to bigger number while keeping track of how many you count.
Use number line to help. 12-8=4
Day at the Fair: Fun House - 7 tickets, Face Painting - 7
How many tickets to visit the fun house and get your face painted?
7+7=14
39+6=?
45
49-15=?
34
Doubles Plus 1
6+7=?
If you know your doubles it's easy just 1 more.
6+7=13
Number minus itself
7-7=?
There is nothing left
7-7=0
How many tickets to eat all the food and get a drink?
5+4+3+2=14
68+9=?
77
87-23=?
64
Making 10s
6+_=10
Remember to make tens helps you had bigger numbers.
6+4=10 so 26+4=30 and 60+40=100
Half Facts
8-4=?
Remember your doubles. What double makes 8
8-4=4
Day at the Fair: You only get 35 tickets to spend
What would you spend them on at the fair?
Answers vary but need to subtract from 35 for each thing you do.