The Life Starter
Sign up
Grade 2 · lesson 1 of 4

Add Hundreds with an Exchange

Align the supplied place values and add from ones upward.

About 20 minutes, plus any extended practice

Download the grade pack

Supplied materials

  • Paper and a pencil; drawing and spoken explanations are welcome. An adult may read directions and options aloud.
  • Supplied worked-case record: For 156+127, ones total thirteen: one ten and three ones.
  • All quantities and shape descriptions are supplied in the worked example and questions; no purchase or personal information is needed.

Learn the idea

Multi-digit addition joins matching units: ones with ones, tens with tens, hundreds with hundreds. When a place has ten or more groups, exchange ten for one group in the next place. Record the exchange so that no value is counted twice.

Align the supplied place values and add from ones upward. Rename ten ones or ten tens when needed. Recombine the final places and estimate using rounded tens to check that the total is reasonable.

Add the exchanged group into its new place. Regrouping preserves value; it does not create an extra amount. Use a place-value chart and show every exchange with an arrow.

  1. Use a place-value chart and show every exchange with an arrow.
  2. Follow the worked example. Point to each number or shape feature and say what it tells you.
  3. Align the supplied place values and add from ones upward.
  4. Try the question and then the three practice questions. Check your answers and explain any change you make.
Worked example

See the method in action

For 156+127, ones total thirteen: one ten and three ones. Tens then total eight, including the exchanged ten. Hundreds total two. The result is 283. The extra ten came from the thirteen ones, so it must not remain counted in the ones column. Add the exchanged group into its new place. Regrouping preserves value; it does not create an extra amount. Use a place-value chart and show every exchange with an arrow.

Your turn

Check your reasoning

Your answer is temporary and is not saved to an account. Download your current answer before leaving or reloading. Written work on paper or in another app stays in your own file.

Helpful tips
  • Add the exchanged group into its new place.
  • Regrouping preserves value; it does not create an extra amount.
Add using place-value regrouping: 146+128.

Feedback appears here after you check. This is practice, not a graded school assessment.

See the answer and explanation

274

Combine matching places and exchange each full ten in a place. The result is 274.

Take it further

Find 278+146. Expected: 424.

Nothing here is saved to an account or sent to a teacher. The answer download includes your current choice and any checked feedback. It does not include choices from the separate More practice section. Download that section separately.

More practice: try new cases

Choose an answer for each problem. Explain your method on paper, then use the feedback to decide what to revisit.

More practice: try new cases
1. Add using place-value regrouping: 156+129.
Need a hint?
  • Add the exchanged group into its new place.
  • Regrouping preserves value; it does not create an extra amount.
2. Add using place-value regrouping: 166+130.
Need a hint?
  • Add the exchanged group into its new place.
  • Regrouping preserves value; it does not create an extra amount.
3. Add using place-value regrouping: 176+131.
Need a hint?
  • Add the exchanged group into its new place.
  • Regrouping preserves value; it does not create an extra amount.

Your choices are temporary. Feedback appears after you check all the answers.

Nothing here is saved to an account or sent to a teacher. Keep your own notes or download them before leaving. The score describes these questions; it does not certify subject mastery.

Check the subject sources

These LifeStarter passages, scenarios and exercises are authored for this Academy with AI assistance and review. External resources keep their publishers’ terms. A grade label suggests a starting level; it does not establish alignment with your school’s complete requirements.