Grade 1operationsOriginal practice

Addition Parts Within 20

Represent a total as two parts. Connect pictures, stories and addition equations. A complete set with exploration, practice and application. Use the linked unit for the learning sequence and teaching guide.

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Unit goals and teaching guide →

Independent activity · About 25 minutes · Pencil

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Grade 1 · math

Addition Parts Within 20

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Grade 1 · math · continued

Addition Parts Within 20

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Parts make a whole

Addition can combine two parts. Use the picture, count on, or use a known fact. Read what is known and what is missing before solving.

Use the material to work through each task. Show the requested response.

1.How many objects are there altogether?

2.Write an addition equation for the two groups.

3.There are 2 birds. 3 more arrive. How many birds are there now?

4.There are 5 counters. 2 are red. How many are blue?

5.Draw two groups to show 3 + 2.

6.Does 2 + 3 have the same total as 3 + 2? Explain.

Grade 1 · math · Answer key

Addition Parts Within 20

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Open responses use criteria and an illustrative response. Other well-supported responses can be acceptable.

Grade 1 · math · Answer key · continued

Addition Parts Within 20

Scan for answers

Parts make a whole

Addition can combine two parts. Use the picture, count on, or use a known fact. Read what is known and what is missing before solving.

Use the material to work through each task. Show the requested response.

1.How many objects are there altogether?

Answer: 5

2.Write an addition equation for the two groups.

Answer: 2 + 3 = 5

The two parts combine into one total.

3.There are 2 birds. 3 more arrive. How many birds are there now?

Answer: 5

4.There are 5 counters. 2 are red. How many are blue?

Answer: 3

5.Draw two groups to show 3 + 2.

Look for

Shows two parts with 5 objects altogether.

One possible response: 3 objects and 2 objects; 5 altogether.

6.Does 2 + 3 have the same total as 3 + 2? Explain.

Look for

Explains unchanged total rather than only saying yes.

One possible response: Yes. Both totals are 5; the same objects are grouped in a different order.

About this practice

Grade 1 · math · Matching answer key included · US Letter and A4

US Letter practice PDF ↓ · Answer PDF ↓A4 practice PDF ↓ · Answer PDF ↓

Preview the original practice

Addition Parts Within 20: first student practice page

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Teaching guide, sample answers and curriculum references

Before you begin

Count within the number range and recognize addition symbols.

How to use this worksheet

Begin with: How many objects are there altogether?
Connect the response to: There are 2 birds. 3 more arrive. How many birds are there now?
Ask students to apply the idea: Draw two groups to show 3 + 2.

A common mistake to discuss

Writing an answer without connecting the quantities to parts and whole.

What to practice next

Continue to Addition Parts Within 20: Apply and Create.

Original instructional material written for this practice.

Published 2026-10-04; updated 2026-10-04. Original MakeWorksheet practice. Automated consistency checks support publication; independent subject-specialist review is not recorded. Read our editorial policy.

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Addition Parts Within 20: Apply and Create: first student practice page

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Grade 1

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Addition Parts Within 20: Apply and Create

Apply · Independent · 15 min

Represent a total as two parts. Connect pictures, stories and addition equations. A focused apply activity. Use the linked unit for the learning sequence and teaching guide.

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Addition Parts Within 20: Check Your Understanding: first student practice page

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Addition Parts Within 20: Check Your Understanding

Check · Independent · 10 min

Represent a total as two parts. Connect pictures, stories and addition equations. A focused check activity. Use the linked unit for the learning sequence and teaching guide.

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Addition Parts Within 20: Explore and Explain: first student practice page

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Addition Parts Within 20: Explore and Explain

Explore · Independent · 10 min

Represent a total as two parts. Connect pictures, stories and addition equations. A focused learn activity. Use the linked unit for the learning sequence and teaching guide.

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Addition Parts Within 20: Practice Independently: first student practice page

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Addition Parts Within 20: Practice Independently

Practice · Independent · 10 min

Represent a total as two parts. Connect pictures, stories and addition equations. A focused practice activity. Use the linked unit for the learning sequence and teaching guide.

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