Grade 1 · lesson 1 of 4

Make a Ten Before Adding the Rest

Find the first addend’s partner to ten.

About 15 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 9+5, nine needs one to reach ten.
  • All quantities and shape descriptions are supplied in the worked example and questions; no purchase or personal information is needed.

Learn the idea

Ten is a useful landmark when adding across it. Split one addend into the amount needed to reach ten and the amount left over. The split changes how the addition is grouped but does not change how many objects are being added.

Find the first addend’s partner to ten. Take that amount from the second addend, complete ten, and add the remainder. Record all parts so that the second addend is not accidentally counted twice.

Only use enough of the second addend to reach ten. After filling ten, add the leftover part, not the full addend again. Use one ten-frame plus extra marks to show the split.

  1. Use one ten-frame plus extra marks to show the split.
  2. Follow the worked example. Point to each number or shape feature and say what it tells you.
  3. Find the first addend’s partner to ten.
  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 9+5, nine needs one to reach ten. Split five into one and four: 9+1+4=10+4=14. The added parts still total five. The ten-frame model shows a full frame with four extra marks, matching fourteen. Only use enough of the second addend to reach ten. After filling ten, add the leftover part, not the full addend again. Use one ten-frame plus extra marks to show the split.

Your turn

Check your reasoning

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Helpful tips
  • Only use enough of the second addend to reach ten.
  • After filling ten, add the leftover part, not the full addend again.
Use a ten to find 8 + 3.

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

See the answer and explanation

11

Split the second addend to finish ten, then add its remainder. The result is 11.

Take it further

Find 7+6. Expected: 7+3+3=13.

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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. Use a ten to find 9 + 4.
Need a hint?
  • Only use enough of the second addend to reach ten.
  • After filling ten, add the leftover part, not the full addend again.
2. Use a ten to find 8 + 5.
Need a hint?
  • Only use enough of the second addend to reach ten.
  • After filling ten, add the leftover part, not the full addend again.
3. Use a ten to find 9 + 6.
Need a hint?
  • Only use enough of the second addend to reach ten.
  • After filling ten, add the leftover part, not the full addend again.

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.