Math lesson plan · Kindergarten (Reception and Year 1 in England) · 45 minutes
How many are hiding? Find the missing part (to 10)
Addition and subtraction
CCSS K.OA.A.3CCSS K.OA.A.4England: Reception NumberEngland: Y1 Addition and subtraction
Objective and success criteria
Students will: How many are hiding? Find the missing part (to 10).
- 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: Split 6, 7, 8 and 9 into two parts
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 · 5 min
- Quick retrieval from earlier learning (Split 6, 7, 8 and 9 into two parts). Students answer on mini whiteboards.
- Show answers together and note who needs support in the main task.
- 8 = 6 + __ → 2Prompt: Start at 6 and count on to 8.
- Chloe has 6 pencils. 2 are red and the rest are blue. How many are blue? → 4Prompt: The red ones and blue ones together make 6.
- Which pair does NOT make 6? (5 + 1 / 1 + 5 / 5 + 2) → 5 + 2Prompt: Add each pair.
Hook · 5 min
- Give a real shopping total or a score difference and ask for a quick estimate first.
- Share the objective: How many are hiding? Find the missing part (to 10). 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: There are 4 counters. Some are hidden under a cup. You can see these. How many are hiding? ◆ ◆
- Step 1: 2 + 2 = 4
- Step 2: 2
- Answer: 2
- 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.
- There are 5 counters. Some are hidden under a cup. You can see these. How many are hiding? ◆ ◆ ◆ ◆ → 1Prompt: Count the ones you can see: that is one part of 5.
- Hana had 10 toy cars. 3 are on the mat and the rest are in the box. How many are in the box? → 7Prompt: The two parts together make 10.
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.
- There are 8 counters. Some are hidden under a cup. You can see these. How many are hiding? ◆ ◆ ◆ ◆ ◆ ◆ ◆ → 1Prompt: Count the ones you can see: that is one part of 8.
- Mei had 6 toy cars. 2 are on the mat and the rest are in the box. How many are in the box? → 4Prompt: The two parts together make 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: Split 6, 7, 8 and 9 into two parts.
- 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/kindergarten.
Free lesson plan from eurekami.com/lesson-plan-builder