Math lesson plan · 1st grade (Year 2 in England) · 60 minutes
Story problems: taking away and taking apart (to 20)
Addition and subtraction
CCSS 1.OA.A.1England: Y1 Addition and subtraction
Objective and success criteria
Students will: Story problems: taking away and taking apart (to 20).
- 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: Subtract within 20; Story problems: taking away (to 10)
Leads to: the next skill in this area.
Materials: Base-ten blocks, Number lines, Hundred square, Mini whiteboards and pens, Printed student sheet (below).
Warm-up · 6 min
- Quick retrieval from earlier learning (Subtract within 20; Story problems: taking away (to 10)). Students answer on mini whiteboards.
- Show answers together and note who needs support in the main task.
- Zara had 5 pencils. Zara gave 3 to Elena. How many pencils does Zara have left? → 2Prompt: Zara gives some away, so the amount gets smaller.
- Yuki has 15 shells. Diego has 5. How many more shells does Yuki have than Diego? → 10Prompt: Are we taking away or finding a difference? Both are subtraction.
- Ben had 7 strawberries. Ben gave 5 to Leo. How many strawberries does Ben have left? → 2Prompt: Ben gives some away, so the amount gets smaller.
Hook · 6 min
- Give a real shopping total or a score difference and ask for a quick estimate first.
- Share the objective: Story problems: taking away and taking apart (to 20). 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: Leo had 13 blocks. Leo gave 2 to Mateo. How many blocks does Leo have left?
- Step 1: 13 − 2 = 11
- Step 2: 11
- Answer: 11
- 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.
- Leo had 14 marbles. Leo gave 8 to Fatima. How many marbles does Leo have left? → 6Prompt: Leo gives some away, so the amount gets smaller.
- Fatima has 18 toy cars. 8 are in a bag and the rest are on the floor. How many toy cars are on the floor? → 10Prompt: The whole is 18. One part is 8.
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.
- Luis has 19 strawberries. Kai has 5 fewer strawberries than Luis. How many strawberries does Kai have? → 14Prompt: Who has fewer, Luis or Kai?
- Tariq has 12 toy cars. 6 are in a bag and the rest are on the floor. How many toy cars are on the floor? → 6Prompt: The whole is 12. One part is 6.
Watch out for
- Subtracting the smaller digit from the bigger one in every column (52 − 17 = 45).
- Forgetting to add the regrouped (carried) ten.
Support and stretch
Support
- Review first: Subtract within 20.
- Use concrete materials: base-ten blocks.
- 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-1.
Free lesson plan from eurekami.com/lesson-plan-builder