Math lesson plan · 1st grade (Year 2 in England) · 45 minutes
Find 10 more and 10 less
Number sense
CCSS 1.NBT.C.5England: Y1 Number and place valueEngland: Y2 Number and place value
Objective and success criteria
Students will: Find 10 more and 10 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: Tens and ones
Leads to: Find 10 or 100 more or less; Add tens to a two-digit number
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 (Tens and ones). Students answer on mini whiteboards.
- Show answers together and note who needs support in the main task.
- How many tens are in 98? → 9Prompt: In a two-digit number, the left digit tells the tens and the right digit tells the ones.
- What number is 1 tens and 5 ones? → 15Prompt: What is 1 tens worth?
- How many tens are in 84? → 8Prompt: In a two-digit number, the left digit tells the tens and the right digit tells the ones.
Hook · 5 min
- Show a number in the news or a price tag and ask what each digit is worth.
- Share the objective: Find 10 more and 10 less. 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: Liam has 43 crayons and gives a pack of 10 away. How many are left?
- Step 1: 43 − 10 = 33
- Step 2: 33
- Answer: 33
- 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.
- Felix has 74 crayons and gets a pack of 10 more. How many now? → 84Prompt: A pack of 10 is one ten.
- 73 is 10 less than which number? → 83Prompt: The number you want is bigger than 73.
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.
- Omar has 38 marbles and gets a pack of 10 more. How many now? → 48Prompt: A pack of 10 is one ten.
- 75 is 10 less than which number? → 85Prompt: The number you want is bigger than 75.
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: Tens and ones.
- 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: Find 10 or 100 more or less; Add tens to a two-digit number.
- 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-1.
Free lesson plan from eurekami.com/lesson-plan-builder