Math lesson plan · 1st grade (Year 2 in England) · 45 minutes
Story problems: find the missing change
Addition and subtraction
CCSS 1.OA.A.1CCSS 1.OA.D.8England: Y1 Addition and subtractionEngland: Y2 Addition and subtraction
Objective and success criteria
Students will: Story problems: find the missing change.
- 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: Story problems: adding on and putting together (to 20); Subtract by thinking of an addition
Leads to: Story problems: work out the starting amount
Materials: Base-ten blocks, Number lines, Hundred square, Mini whiteboards and pens, Printed student sheet (below).
Warm-up · 5 min
- Quick retrieval from earlier learning (Story problems: adding on and putting together (to 20); Subtract by thinking of an addition). Students answer on mini whiteboards.
- Show answers together and note who needs support in the main task.
- Kofi has 8 birds. Leo gives Kofi 5 more. How many birds does Kofi have now? → 13Prompt: Kofi gets more, so the amount grows.
- There are 11 strawberries on the table and 7 strawberries in a box. How many strawberries are there altogether? → 18Prompt: Altogether means put both groups together.
- 6 + 7 = 13. Use this to find 13 − 6. → 7Prompt: 6 and what make 13?
Hook · 5 min
- Give a real shopping total or a score difference and ask for a quick estimate first.
- Share the objective: Story problems: find the missing change. 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: Zoe had 8 flowers. Arjun gave Zoe some more. Now Zoe has 13. How many flowers did Arjun give?
- Step 1: 8 + 5 = 13
- Step 2: 5
- Answer: 5
- 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.
- Tariq had 10 beads. Aisha gave Tariq some more. Now Tariq has 17. How many beads did Aisha give? → 7Prompt: 10 + ? = 17
- Kai had 12 ducks. Kai gave some to Diego. Now Kai has 3 left. How many ducks did Kai give away? → 9Prompt: Kai started with 12 and ended with 3.
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.
- Hiro had some ducks. Then Hiro got 6 more. Now Hiro has 11. How many ducks did Hiro have at the start? → 5Prompt: ? + 6 = 11
- Mei had 12 birds. Zara gave Mei some more. Now Mei has 15. How many birds did Zara give? → 3Prompt: 12 + ? = 15
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: Story problems: adding on and putting together (to 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
- Move on to: Story problems: work out the starting amount.
- 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