What is Addition?
Addition means:
👉 putting things together
Example:
🍎🍎 + 🍎 = ?
We put them together:
🍎🍎🍎
There are 3 apples
Counting On
We can add by counting on
Example:
2 + 3
Start at 2:
👉 3… 4… 5
Answer: 5
Counting On Example
Using the + and = Symbols
We use:
➕ means add
= means is equal to
Example:
2 + 3 = 5
Adding with Objects
🍎🍎 + 🍎🍎🍎
Count all:
1… 2… 3… 4… 5
Answer: 5 apples
Horizontal Addition
We write addition like this:
3 + 4 = 7
5 + 2 = 7
6 + 3 = 9
👉 We read from left to right
What is Subtraction?
Subtraction means:
👉 taking away
Example:
🍎🍎🍎 − 🍎
We take one away:
🍎🍎
There are 2 apples left
Taking Away
Example:
5 − 2
Start with 5:
👉 Take away 2
5 → 4 → 3
Answer: 3
Subtraction Symbols
➖ means take away
= means is equal to
Example:
5 − 2 = 3
Subtract with Objects
🍪🍪🍪🍪 − 🍪🍪
Take away 2:
🍪🍪
Answer: 2
Horizontal Subtraction
6 − 2 = 4
9 − 3 = 6
10 − 5 = 5
👉 Read from left to right
Addition and Subtraction
➕ Addition → putting together
➖ Subtraction → taking away
Example:
3 + 2 = 5
5 − 2 = 3
What we Learned
Today we learned:
✔ Addition means putting together
✔ Subtraction means taking away
✔ How to use +, −, =
✔ How to add and subtract up to 20
