Year 3 · Addition

Add 3-digit numbers

Two ways to add 347 + 285: jump along a number line in easy steps (you can see the number growing), or line the digits up in columns.

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Method 1, jumps: start at the first number.
Jump by the hundreds, then the tens, then the ones of the second number.
Where you land is the answer.
Method 2, columns: add the ones. If they make 10 or more, write the ones digit and carry 1.
Add the next column, plus any carry. Keep going left.

Method 1: Jumps

Start at 347. Jump forward by 200, then 80, then 5.

347 + 285

347 + 200 = 547

547 + 80 = 627

627 + 5 = 632

347 + 285 = 632

Method 2: Columns

Line up the digits. Add each column from the right, carrying when you pass 10.

347 + 285

Work right to left, one column at a time.

347 + 285 = 632

With a free account, these play as step-by-step animations.

Watch out

Do not forget the carried 1.

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