Complete the addition sentence – up to three digits

Key notes:

✨ Key Points

Addition Sentence means joining numbers with a plus (+) sign to get the total.

• Example: 125 + 134 = 259
• Parts of an Addition Sentence
• Addend + Addend = Sum
• Example: 200 + 150 = 350
• 200 and 150 are addends
• 350 is the sum

Steps to Complete an Addition Sentence

• Line up the numbers → hundreds, tens, ones.
• Start adding from the ones place.
• If the sum is more than 9, carry over to the next column.
• Fill in the missing number (the blank).

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📝 Solved Examples

Find the missing sum
245 + 123 = ___

• Add ones: 5 + 3 = 8
• Add tens: 4 + 2 = 6
• Add hundreds: 2 + 1 = 3
  ✅ Answer: 368

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Find the missing addend
___ + 132 = 350

• Think: 350 – 132 = 218
• ✅ Answer: 218

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Find the missing addend
275 + ___ = 400

• Think: 400 – 275 = 125
• ✅ Answer: 125

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🎯 Practice Activity

Complete the addition sentences:

• 128 + 234 = ___
• 146 + ___ = 300
• ___ + 215 = 450

Word Problem:
A shop sold 156 toys in the morning and 122 toys in the evening.
Write the addition sentence and find the total toys sold.

Learn with an example