Balance addition equations – up to two digits
key points :
🎯 What Does “Balance Equations” Mean?
- A balanced equation is like a seesaw ⚖️—both sides must be equal.
- Whatever is on the left side = right side.
➕⚖️ Key Points to Remember
1️⃣ Both sides must have the same total
Example:
8 + 4 = 12 and 6 + 6 = 12
So,
👉 8 + 4 = 6 + 6 ✔️
2️⃣ You can change the numbers, but NOT the total
If one side is 10, the other side must also be 10.
Example:
7 + 3 = 9 + 1
3️⃣ Use number bonds to find missing numbers 🔢🎈
If:
5 + ___ = 11
Think:
11 – 5 = 6
So the missing number is 6.
4️⃣ Use addition facts you already know 🧠✨
- Doubles facts: 6 + 6, 7 + 7
- Make 10 facts: 8 + 2, 9 + 1
These help balance equations faster!
5️⃣ Check by adding both sides again ✔️
After solving, add both sides to make sure they match.
If they do ➡️ Balanced!
If not ➡️ Fix it! 🔧
6️⃣ Order does NOT matter in addition 🔄
4 + 7 = 7 + 4
This helps balance equations easily!
🌈 Examples
✔️ Balanced
9 + 3 = 10 + 2 🎉
Both sides = 12
❌ Not Balanced
7 + 5 ≠ 6 + 4
Left = 12, Right = 10
⭐ Quick Tips for Students
- Count on your fingers ✋🤚
- Use a number line 📏
- Break apart numbers (10 + 2) 🎯
- Always check both sides ⚖️
Learn with an example
Which number makes the equation true?
11 + 1 = 10 + ___
First, add 11 + 1:
11+1 =10 +?
12 = 10+?
Decide which number makes the addition number sentence true. You can think of an addition fact you know, or you can subtract to find the answer.
The addition fact is:
10 + 2 = 12
Did you remember this addition fact? If not, you can find the answer by subtracting.
Subtract:
12 − 10 = 2
The missing number is 2.
Which number makes the equation true?
21 + 7 = 19 +__
First, add 21 + 7:
21+7 = 19+?
28 =19+?
Decide which number makes the addition number sentence true. You can subtract to find the answer.
Subtract:
28 − 19 = 9
The missing number is 9.
Which number makes the equation true?
11 + 4 =_____ + 2
First, add 11 + 4:
| 11 + 4 | = | ? + 2 |
| 15 | = | ? + 2 |
Decide which number makes the addition number sentence true. You can subtract to find the answer.
Subtract:
15 − 2 = 13
The missing number is 13.
Let’s practice!🖊️

