Balance addition equations – up to three-digit

Key notes:

✨ Key Points

What is an Equation?

• An equation shows that two sides are equal.
• It uses the equals sign (=).
• Example: 250 + 100 = 300 + 50

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What is a Balanced Equation?

• A balanced equation means both sides have the same total.
• Example:
• 200 + 150 = 350
• 300 + 50 = 350

✅ Both sides = 350 → Balanced

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How to Balance Addition Equations:

• Step 1: Add the numbers on the left side.
• Step 2: Add the numbers on the right side.
• Step 3: Check if both sides are equal.
• Step 4: If a number is missing, find it to make both sides equal.

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📝 Examples

Check balance
125 + 200 = 300 + 25

• Left side: 125 + 200 = 325
• Right side: 300 + 25 = 325
  ✅ Balanced

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Find the missing number
150 + ___ = 275 + 25

• Right side: 275 + 25 = 300
• Left side: 150 + ? = 300
• ? = 300 – 150 = 150
  ✅ Answer: 150

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Another example
248 + 132 = ___ + 200

• Left side: 248 + 132 = 380
• Right side: ? + 200 = 380
• ? = 380 – 200 = 180
  ✅ Answer: 180

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🎯 Practice Activity

Check whether the equations are balanced:

• 235 + 140 = 300 + 75
• 126 + 174 = 200 + 100

Fill in the missing numbers:

• 250 + ___ = 300 + 50
• ___ + 125 = 400 + 50
• 175 + 225 = ___ + 200

Learn with an example

Let’s practice!