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Sep 27, 2022

Key Concepts

• Count on the numbers
• Add numbers in any order
• Find the missing numbers

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:

6 + 3 = 9

3 + 6 = 9

→ 6 + 3 = 3 + 6 = 9

Example 2:

Does 5 + 2 = 2 + 5? How do you know?

5 + 2 = 7

2 + 5 = 7

→  5 + 2 = 2 + 5 = 7

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?

6 + 4 = 10

4 + 6 = 10

→ 6 + 4 = 4 + 6 = 10

Find the missing numbers

Example 1:

6 + ______ = 4 + 6

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

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.

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.

What have we learned

• Count on the numbers
• Add numbers in any order
• Find the missing numbers

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