Addition input/output tables – sums to 20

key notes :

📥➡️📤 What is an Input/Output Table?

• An input/output table shows how a number changes using a rule.
• Input = starting number
• Output = result after using the rule
  ✨ Example:
  If the rule is +5,
• Input 3 → Output 8

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➕✨ Addition Rule

The rule tells us how much to add.

Rules may look like:

• +2
• +7
• +10

All answers stay within 0–20 🎯

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🔍 How to Use the Table

1. Look at the rule (example: +6).
2. Take the input number.
3. Add the rule number.
4. Write the output.
   💡 Example: Rule = +4

• Input 5 → 5 + 4 = 9
• Input 10 → 10 + 4 = 14

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🎨 Visualizing Helps!

Use:

• 🧮 Counters
• 🍎 Objects
• ✋ Fingers
  to add easily for sums up to 20.

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🎉 Practice Examples

🌈 Rule: +3

Input	Output
4	7
9	12
15	18

🌈 Rule: +6

Input	Output
2	8
5	11
9	15

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🤔 Find the Rule (Missing Rule)

Sometimes the table shows input and output, and you must find the rule.
✨ Example:

• Input 7 → Output 12
• What is added?
  ✔ 7 + 5 = 12
• Rule = +5

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🛑 Stay Within 20

• Sums must be 20 or less.
• If the sum is more than 20, it doesn’t fit the rule for Grade 2.
  💡 Example: 18 + 5 ❌ (more than 20)

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🎓 Why It’s Important

• Helps children understand patterns 🔢
• Builds addition skills ➕
• Supports logical thinking 🧠

Learn with an example

Let’s practice!🖊️