Math lesson plan · 2nd grade (Year 3 in England) · 30 minutes
Find 10 or 100 more or less
Number sense
CCSS 2.NBT.B.8England: Y2 Number and place valueEngland: Y3 Number and place value
Objective and success criteria
Students will: Find 10 or 100 more or less.
- 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: Find 10 more and 10 less; Hundreds, 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 · 4 min
- Quick retrieval from earlier learning (Find 10 more and 10 less; Hundreds, tens and ones). Students answer on mini whiteboards.
- Show answers together and note who needs support in the main task.
- Daniel has 17 leaves and gets a pack of 10 more. How many now? → 27Prompt: A pack of 10 is one ten.
- Mei has 51 strawberries and gets a pack of 10 more. How many now? → 61Prompt: A pack of 10 is one ten.
- Elena has 38 marbles and gives a pack of 10 away. How many are left? → 28Prompt: A pack of 10 is one ten.
Hook · 3 min
- Show a number in the news or a price tag and ask what each digit is worth.
- Share the objective: Find 10 or 100 more or less. Read the success criteria together.
I do: model it · 7 min
- Work through the example out loud, saying why you do each step, not just what you do.
- Example: What is 100 more than 289?
- Step 1: 289 + 100 = 389
- Step 2: 389
- Answer: 389
- Pause after each step and ask a student to say what comes next.
We do: guided practice · 6 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 is 100 less than 709? → 609Prompt: Change the hundreds digit.
- What is 10 more than 198? → 208Prompt: The tens digit is 9. Adding a ten makes a new hundred.
You do: independent practice · 7 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 6 questions are on the student sheet below, with answers in the key.
Exit ticket · 3 min
- Two questions on their own. Sort answers into got it / nearly / not yet to plan the next lesson.
- What is 100 more than 330? → 430Prompt: Change the hundreds digit.
- 509 is 10 more than what number? → 499Prompt: The mystery number is smaller than 509.
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: Find 10 more and 10 less.
- 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