Add Two-Digit Numbers Without Regrouping

Add Two-Digit Numbers Without Regrouping

What students learn

Students learn how to add two-digit numbers when each place can be added separately. Start with Add 2-Digit Numbers: Add the Ones First so students can see the setup before the strategy is named.

Why it matters

This skill helps students add with confidence because they are not guessing or counting every single object. They are using place value on purpose. When they are ready for a faster strategy, Make a Ten: Break Apart 17 shows how one addend can be split so a new ten is formed first.

Learn the idea

In no-regrouping addition, the ones add to a number under 10 and the tens add to a number under 10. That keeps the work simple and clear. After the first example, use Add 2-Digit Numbers: Add the Tens After to show how the tens finish the problem. Then turn to Make a Ten: Rebuild the Sum with the New Ten to see why making a ten can still be a clean way to think about the same numbers.

Try it

Ask the student to solve 34 + 12, 41 + 26, and 53 + 15. Have them say the tens first and the ones second, then point to the place value that each digit belongs to. If they need a model, replay the make-ten clip and compare it with the straight place-by-place method.

Parent guide

Use base-ten blocks, bundles of sticks, or quick drawings. Keep the language simple: tens with tens, ones with ones. If a child starts counting by ones only, pause and ask them to name the tens and ones in each addend before they compute the sum.