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Two- and Three-Digit Addition

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Two-Digit Addition: Break Apart Strategy

Add tens, add ones, then combine

Break each addend into tens and ones, add the matching place-value parts, and combine those results to find the sum.

Models and flash-card practice

Build the next multiple of 10 with ten frames, cubes, or a number line, then practice without a model using flash cards.

Make the next ten

Make the next ten, add friendly tens to reach the target, then combine both parts to find the missing addend.

Add tens and ones without making a new ten

Combine the ones and tens on a place-value mat to solve two-digit addition problems that do not need regrouping.

Bundle 10 ones to make a new ten

Combine the ones, fill the ten frame, and regroup 10 ones as a new ten in every two-digit addition problem.

Add with and without regrouping

Combine tens and ones, bundle 10 ones into a new ten when needed, and solve two-digit addition problems.

Add hundreds, tens, and ones without trading

Combine hundreds, tens, and ones on a place-value mat to solve three-digit addition problems without regrouping.

Regroup ones and tens when needed

Combine hundreds, tens, and ones, regroup 10 ones as a ten and 10 tens as a hundred, then solve.

Decide when a place needs to be regrouped

Solve mixed three-digit addition problems and use the place-value model to decide when 10 ones or 10 tens need to be traded.