Addition Fact Strategies
Key Concepts
- Count on the numbers
- Add numbers below 20
- Add numbers in any order
- Find the missing numbers
Addition fact strategies
An equation uses an equal sign (=) to show that the value on the left is the same as the value on the right.
Example 1:
Answer:
6 + 3 = 9
3 + 6 = 9
→ 6 + 3 = 3 + 6 = 9
Example 2:
Does 5 + 2 = 2 + 5? How do you know?
Answer:
5 + 2 = 7
2 + 5 = 7
→ 5 + 2 = 2 + 5 = 7
Addends
You can change the order of the addends.
Example 1:
You can add numbers in any order, and the sum is the same.
So, 6 + 3 = 3 + 6.
You can write the facts this way, too
Example 2:
Does 6 + 4 = 4 + 6? How do you know?
Answer:
6 + 4 = 10
4 + 6 = 10
→ 6 + 4 = 4 + 6 = 10
Find the missing numbers
Example 1:
6 + ______ = 4 + 6
Answer:
Here, we can observe equal sign which shows that the value on the left is the same as the value on the right.
4 + 6 = 10
And 6 + ___ = 10
→ 10 – 6 = 4
→ So, the missing number is 4
Example 2:
8 + 2 = ____ + 8
Answer:
Here, we can observe an equal sign which shows that the value on the left is the same as the value on the right.
8 + 2 = 10
And ___ + 8= 10
→ 10 – 8 = 2
→ So, the missing number is 2
Example 3:
Add the numbers displayed on the top of the dice.
Answer:
6 + 1 = 7
Example 4:
Count the total number of apples and oranges. Find the total number of fruits.
Solution:
Number of apples = 10
Number of oranges = 16
Total number of fruits = 10 + 16 = 26
Exercise
- Count on to find the sum. Then change the order of the addends.
- Count on to find the sum. Then change the order of the addends.
- Count on to find the sum. Then change the order of the addends.
- Count on to find the sum. Then change the order of the addends.
- Count on to find the sum. Then change the order of the addends.
- Count on to find the sum. Then change the order of the addends.
- Count on to find the sum. Then change the order of the addends.
- Count on to find the sum. Then change the order of the addends.
- Find the missing numbers:
Summary
- Counting on the greater number is easier.
- An equation uses an equal sign (=) to show that the value on the left is the same as the value on the right.
- You can change the order of the addends.
Concept Map
What have we learned
- Count on the numbers
- Add numbers below 20
- Add numbers in any order
- Find the missing numbers
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