Math lesson plan · 2nd grade (Year 3 in England) · 45 minutes
Rename numbers using hundreds, tens and ones
Number sense
CCSS 2.NBT.A.1aCCSS 2.NBT.A.1England: Y3 Number and place value
Objective and success criteria
Students will: Rename numbers using hundreds, tens and ones.
- 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: Write three-digit numbers in expanded form; The same number made in different ways with tens and ones
Leads to: the next skill in this area.
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 (Write three-digit numbers in expanded form; The same number made in different ways with tens and ones). Students answer on mini whiteboards.
- Show answers together and note who needs support in the main task.
- 423 = __ + 20 + 3 → 400Prompt: Expanded form shows what each digit is worth.
- Which is 506 in expanded form? (500 + 60 / 5 + 0 + 6 / 50 + 6 / 500 + 6) → 500 + 6Prompt: 506 has 0 tens.
- Chloe wrote 172 = 1 + 7 + 2. What should the first part, the hundreds, be? → 100Prompt: Does 1 + 7 + 2 really add up to 172?
Hook · 5 min
- Show a number in the news or a price tag and ask what each digit is worth.
- Share the objective: Rename numbers using hundreds, tens and ones. 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: What number is 5 hundreds, 17 tens and 5 ones?
- Step 1: 500 + 170 + 5 = 675
- Step 2: 675
- Answer: 675
- 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.
- What number is 5 hundreds, 12 tens and 6 ones? → 626Prompt: 12 tens is more than 10 tens. 10 tens make a hundred.
- How many tens are in 950 altogether? → 95Prompt: Each hundred is 10 tens.
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.
- How many tens are in 230 altogether? → 23Prompt: Each hundred is 10 tens.
- What number is 2 hundreds, 17 tens and 2 ones? → 372Prompt: 17 tens is more than 10 tens. 10 tens make a hundred.
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: Write three-digit numbers in expanded form.
- 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
- 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-2.
Free lesson plan from eurekami.com/lesson-plan-builder