Complete the addition sentence – up to two digits

key points :

🧠 What Is an Addition Sentence?

An addition sentence shows two numbers being added to make a total.
➕ Example: 12 + 5 = ⬜

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🔢 Add Two-Digit and One-Digit Numbers

You can add by:

• 👉 Counting on
• 👉 Using fingers
• 👉 Using number line
• 👉 Adding tens and ones

Example:
24 + 3 = 27

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🎯 Tens and Ones Help!

Break the number:

• 24 = 2 tens and 4 ones
  Then add:
  4 ones + 3 ones = 7 ones
  So, 24 + 3 = 27 ✔️

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📏 Use the Number Line Method

Jump forward:
Start at 15, make 4 jumps → 19
So, 15 + 4 = 19 😊

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🟩 Filling the Missing Number

Sometimes the missing number is:

• ➕ A number being added
• 🟰 The answer (sum)

Examples:

• 13 + ⬜ = 18 → Missing number is 5
• ⬜ + 6 = 15 → Missing number is 9

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🌈 Use Backward Thinking (Subtraction Trick!)

To find the missing number:
If 13 + ⬜ = 20,
Do: 20 – 13 = 7

So, the missing number is 7! 🎉

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⭐ Check Your Answer

After filling the blank, add again to check:
11 + 8 = 19
✔️ Correct!

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🥳 Practice Makes You Faster

More practice = Faster addition! 🔢💨
Try to use mental math more often.

Learn with an example

Let’s practice!🖊️