Math lesson plan · 2nd grade (Year 3 in England) · 60 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 · 6 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.
- 398 = 300 + 90 + __ → 8Prompt: Expanded form shows what each digit is worth.
- Which is 501 in expanded form? (500 + 10 / 50 + 1 / 500 + 1 / 5 + 0 + 1) → 500 + 1Prompt: 501 has 0 tens.
- Ava wrote 148 = 1 + 4 + 8. What should the first part, the hundreds, be? → 100Prompt: Does 1 + 4 + 8 really add up to 148?
Hook · 6 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 · 12 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 · 12 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 7 hundreds, 18 tens and 0 ones? → 880Prompt: 18 tens is more than 10 tens. 10 tens make a hundred.
- How many tens are in 450 altogether? → 45Prompt: Each hundred is 10 tens.
You do: independent practice · 17 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 · 7 min
- Two questions on their own. Sort answers into got it / nearly / not yet to plan the next lesson.
- How many tens are in 860 altogether? → 86Prompt: Each hundred is 10 tens.
- What number is 1 hundred, 11 tens and 5 ones? → 215Prompt: 11 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