How it works
Addition means putting two groups together to find out how many in all. When you see 1 + 2, it means start with 1, and then add 2 more.
Here are some ways to think about 1 + 2:
- Counting on: Start at 1, then count 2 more numbers.
- Using objects: Use your fingers, blocks, or draw dots to help you see the groups.
- Addition sentence: 1 + 2 means "1 and 2 more."
Let's practice with an example!
Worked example
What is 2 + 3?
- 1
Start with 2.
We begin at the first number, which is 2.
- 2
Count on 3 more: 3, 4, 5.
We count three more numbers after 2. Say each number as you count: 3, 4, 5.
- 3
Stop after you have counted 3 numbers.
We only add 3 to our starting number.
Answer
The answer is 5.
Common mistakes
- 01
Counting the first number as '1' instead of starting from it.
Why: Sometimes students start counting at 1 instead of the first number given.
Avoid it: Remember to start at the first number and count up from there.
- 02
Not counting the right amount of numbers to add.
Why: Students may lose track while counting.
Avoid it: Use fingers or objects to keep track of how many you have added.
Practice
Answers stay hidden
1.1 + 4
Show hint
Start at 1 and count four more: 2, 3, 4, 5.
Reveal answer
5
2.3 + 2
Show hint
Start at 3 and count two more: 4, 5.
Reveal answer
5
3.2 + 5
Show hint
Start at 2, count up five times. Use your fingers if you need to.
Reveal answer
7