Math lesson plan · 3rd grade (Year 4 in England) · 45 minutes
Write four-digit numbers in expanded form
Number sense
CCSS 4.NBT.A.2England: Y4 Number and place value
Objective and success criteria
Students will: Write four-digit numbers in expanded form.
- I can answer questions on today's skill on my own, without help.
- I can explain each step and say why it works.
- I can check my answer and spot a mistake.
Before and after
Needs first: Value of a digit in four-digit numbers
Leads to: Expanded form of numbers up to 1 000 000
Materials: Place value chart, Base-ten blocks or a number line, Mini whiteboards and pens, Printed student sheet (below).
Warm-up · 5 min
- Quick retrieval from earlier learning (Value of a digit in four-digit numbers). Students answer on mini whiteboards.
- Show answers together and note who needs support in the main task.
- In 6291, which place is the digit 1 in? (ones / tens / hundreds / thousands) → onesPrompt: Name the places from the right: ones, tens, hundreds, thousands.
- What is the value of the digit 9 in 6908? → 900Prompt: Which place is the digit in?
- Which number has the digit 8 in the hundreds place? (2385 / 9879 / 4618 / 8619) → 9879Prompt: The hundreds place is 2 places from the right end.
Hook · 5 min
- Show a number in the news or a price tag and ask what each digit is worth.
- Share the objective: Write four-digit numbers in expanded form. Read the success criteria together.
I do: model it · 10 min
- Work through the example out loud, saying why you do each step, not just what you do.
- Example: Write 6418 in expanded form. What goes in the gap? 6000 + __ + 10 + 8
- Step 1: 6418 = 6000 + 400 + 10 + 8
- Step 2: 400
- Answer: 400
- Pause after each step and ask a student to say what comes next.
We do: guided practice · 10 min
- Do these together. Students try each step on whiteboards before you reveal it.
- Use the hints as prompts rather than giving the answer.
- Write 9912 in expanded form. What goes in the gap? 9000 + __ + 10 + 2 → 900Prompt: Each part is one digit times its place value.
- Write as a number: 600 + 3000 + 6 + 70 → 3676Prompt: Put each part in its place: thousands, hundreds, tens, ones.
You do: independent practice · 10 min
- Students work on the student sheet. Circulate and check the first two answers of every student early.
- Students who finish: write a question of their own for a partner, with the answer.
The 8 questions are on the student sheet below, with answers in the key.
Exit ticket · 5 min
- Two questions on their own. Sort answers into got it / nearly / not yet to plan the next lesson.
- Write 2775 in expanded form. What goes in the gap? 2000 + __ + 70 + 5 → 700Prompt: Each part is one digit times its place value.
- Write as a number: 6 + 700 + 4000 + 80 → 4786Prompt: Put each part in its place: thousands, hundreds, tens, ones.
Watch out for
- Reading 1,045 as one thousand four hundred five: point to each place and say its value.
- Thinking a longer number is always bigger, even with decimals (0.45 vs 0.5).
Support and stretch
Support
- Review first: Value of a digit in four-digit numbers.
- Use concrete materials: place value chart.
- Give the first step of each question, or a partly worked example to finish.
- Pair with a confident partner for the guided practice.
Stretch
- Move on to: Expanded form of numbers up to 1 000 000.
- Explain a common mistake in writing and how to fix it.
- Write a word problem that uses today's skill, then solve a partner's.
Homework and more practice
Free online practice with hints and printable worksheets for this skill: eurekami.com/math/grade-3.
Free lesson plan from eurekami.com/lesson-plan-builder