You will learn
- Write expanded form with addition.
- Write expanded form with multiplication.
- Convert back to standard form.
- Handle zeros in the middle.
Version 0.1 · published for early use · expert review pending Standards alignment: pending verification. Not yet reviewed against the Courseversity scorecard.
Student lesson
Words to know
Sum of place values.
Normal way to write a number.
Value by position.
Total.
1. Discover: taking it apart
3,456,789 can be taken apart place by place. How would you write it as a sum?
2. Understand: expanded form
- 3,456,789 = 3,000,000 + 400,000 + 50,000 + 6,000 + 700 + 80 + 9.
- With multiplication: 3×1,000,000 + 4×100,000 + 5×10,000 + 6×1,000 + 7×100 + 8×10 + 9×1.
- Zeros: 2,050,300 = 2,000,000 + 50,000 + 300.
3. Explore: expand
You need paper.
- Write 3,456,789.
- Write each digit with its value.
- Add to check.
- Do 2,050,300.
Think about it: what did you notice?
2,000,000 + 50,000 + 300.
4. Practise
Guided practice
Question 1. Expand 2,050,300.
2,000,000 + 50,000 + 300.
Question 2. Standard: 6,000,000 + 20,000 + 5?
6,020,005.
Question 3. Value of 5 in 3,456,789?
50,000.
Independent practice
- Expand 4,300,060
- Standard: 900,000 + 8,000 + 20
- Expand 1,000,001
- Standard: 5×10,000 + 3×1,000 + 7
- Value of 7 in 3,456,789
Answers are in the answer key below. Try first, then check.
5. Apply: everyday mathematics
A stadium has 45,208 seats. Write this in expanded form.
Show a sample answer
40,000 + 5,000 + 200 + 8.
6. Common mistake
Fix: Skip zero places.
7. Check and master
Answer all questions. You will see feedback after each one.
Your result appears here after you answer every question.
8. Key takeaways
- Digit times place.
- Skip zeros.
- Check by adding.
9. Next lesson
Next lesson: Comparing and ordering numbers. Keep going with the next idea in this course.
Printable worksheet
- Expand 4,300,060
- 900,000 + 8,000 + 20
- Expand 1,000,001
- 5×10,000 + 3×1,000 + 7
- Value of 7 in 3,456,789
Homework
Expand five large numbers.
Answer key and marking scheme
| Question | Expected response | Marks |
|---|---|---|
| Expand 4,300,060 | 4,000,000 + 300,000 + 60 | 2 |
| 900,000 + 8,000 + 20 | 908,020 | 2 |
| Expand 1,000,001 | 1,000,000 + 1 | 2 |
| 5×10,000 + 3×1,000 + 7 | 53,007 | 2 |
| Value of 7 in 3,456,789 | 700 | 2 |
| Total | 10 |
Practice answers: Worksheet: 1 4,000,000 + 300,000 + 60; 2 908,020; 3 1,000,000 + 1; 4 53,007; 5 700.
Quiz answers: 1 A, 2 B, 3 C, 4 A, 5 B, challenge C.
Mastery and remediation
| Objective | Bronze (Developing) | Silver (Proficient) | Gold (Advanced) |
|---|---|---|---|
| O1 Write expanded form with addition | Shows this with help from an adult or a picture | Does this independently and explains how they know | Explains it clearly and uses it in a new situation |
| O2 Write expanded form with multiplication | Shows this with help from an adult or a picture | Does this independently and explains how they know | Explains it clearly and uses it in a new situation |
| O3 Convert back to standard form | Shows this with help from an adult or a picture | Does this independently and explains how they know | Explains it clearly and uses it in a new situation |
| O4 Handle zeros in the middle | Shows this with help from an adult or a picture | Does this independently and explains how they know | Explains it clearly and uses it in a new situation |
Proposed Courseversity thresholds for this page: Bronze = at least 3 of 5 core questions correct; Silver = all 5; Gold = all 5 plus the challenge. A badge is never a full record of progress.
If a learner struggles
- Find the misconception: Writing 0 for missing places. Skip zero places.
- Explain another way: use real objects first, then pictures.
- Show a simpler example: Use place value cards.
- Guided practice: work through one example together and let the learner try the next one.
- Reassess: use the quiz again or the worksheet.
- Move on when the learner shows Silver-level evidence independently.
Teacher package
1–5. Objectives, prerequisites, materials, preparation, duration
Lesson objectives. Learners will: write expanded form with addition; write expanded form with multiplication; convert back to standard form; handle zeros in the middle.
Prerequisite knowledge. Lessons 1 and 2.
Materials. Counters (stones, seeds or bottle tops), paper, pencils, board or chalkboard. Low-resource options: use stones, seeds, sticks, bottle tops or drawings in the sand or on the board instead of printed materials.
Preparation. Gather the counters and draw the example pictures on the board before the lesson.
Suggested duration. 35–45 minutes.
6–9. Teaching procedure, explanation notes, guided and independent activities
Introduction (5 min). Start with the Discover situation and let learners suggest ideas before you teach.
Explanation (10 min). Teach the Understand section with real objects first, then pictures, then symbols and words.
Guided activity (10 min). You need paper. Learners follow the Explore steps in pairs.
Independent activity (10 min). Learners complete the independent practice and the worksheet.
Assessment and reflection (5 min). Ask each learner to say one thing they learned and how they know it.
Teacher explanation notes. Use the concrete, pictorial, abstract order: real objects first, then pictures, then symbols and words. Return to real objects whenever a learner needs support.
10–12. Differentiation, formative assessment, common misconceptions
Support. Use real objects and work with a partner; say each step aloud together. Extension. Ask learners to make up their own example and explain it to a partner.
Formative assessment. Listen to learner explanations, ask “how do you know?”, and check the independent work.
Misconceptions. Writing 0 for missing places. Skip zero places.
13–15. Assessment questions, answer keys, marking scheme
Use the quiz and worksheet on this page. The 10-mark scheme and all answers are in the answer key above. Re-check every answer and the marking scheme before publication.
16–19. Remediation, enrichment, homework, teacher reflection
Remediation. Use place value cards. Enrichment. Invite learners to find or create three more examples at home or in the classroom and explain them. Homework. See above.
Teacher reflection. After teaching, record: which concepts learners understood; which misconceptions occurred; which activities worked; which learners need more practice; and what to improve next time.
Sources and standards
Alignment is pending verification and no external endorsement is claimed. Reference starting points named in the Courseversity standard: Common Core State Standards for Mathematics, Cambridge Primary and the IB Primary Years Programme. Specific standard codes will be added once checked against the official documents.