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BB.1 Addition word problems up to three digits

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What are addition word problems?

Addition word problems are math problems written as stories. They ask you to combine two or more numbers to find a total.

Example:
  • “Sam has 245 marbles. He gets 132 more. How many marbles does he have now?”
Note

Look for clue words like in all, together, or total. These often mean you need to add.

Steps to solve addition word problems

Follow these steps when solving an addition word problem:

Steps:
  • 1. Read: Understand the story problem.
  • 2. Find: Identify the numbers you need to add.
  • 3. Solve: Add the numbers carefully.
  • 4. Check: Make sure your answer makes sense in the story.
Note

Always connect your answer back to the story. Ask yourself: “Does my number fit what the problem is asking?”

Adding with three-digit and two-digit numbers

When solving with a big three-digit number and a smaller two- or three-digit number, it helps to break the smaller number into parts.

Example:
  • Problem: “There are 326 apples in a basket. A farmer adds 48 more. How many apples are there now?”
  • Break apart 48 → 40 + 8
  • 326 + 40 = 366
  • 366 + 8 = 374
  • Answer: There are 374 apples in all.
Note

Breaking apart numbers makes addition easier. Always add the tens first, then the ones.

Adding with regrouping

Sometimes, when you add, the sum in the ones or tens place is greater than 9. This is called regrouping. You move extra ones or tens to the next place value.

Example:
  • Problem: “A library has 286 books. They get 159 more. How many books are there now?”
  • 286 + 159 = ?
  • Add ones: 6 + 9 = 15 → write down 5, regroup 1 ten.
  • Add tens: 8 + 5 + 1 (regrouped) = 14 → write down 4, regroup 1 hundred.
  • Add hundreds: 2 + 1 + 1 (regrouped) = 4.
  • Total = 445 books.
Note

Always start adding from the ones place. Carry over any extra tens or hundreds to the next column.

Checking your answer

After solving, check that your answer makes sense in the problem. You can also use subtraction to check addition.

Example:
  • Problem: 326 + 48 = 374
  • Check: 374 − 48 = 326 ✔
Note

Checking helps you avoid small mistakes. If the subtraction works, your addition is correct.