Math lesson plan · Kindergarten (Reception and Year 1 in England) · 45 minutes
Plus or minus? Choose the sign
Addition and subtraction
CCSS K.OA.A.1CCSS K.OA.A.5England: Reception NumberEngland: Y1 Addition and subtraction
Objective and success criteria
Students will: Plus or minus? Choose the sign.
- 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: Match a number sentence to a picture or story
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 (Match a number sentence to a picture or story). Students answer on mini whiteboards.
- Show answers together and note who needs support in the main task.
- Which number sentence matches the picture? ♥ ♥ ♥ ♥ ♥ ♥ + ♥ ♥ ♥ (6 − 3 = 3 / 6 + 4 = 10 / 7 + 3 = 10 / 6 + 3 = 9) → 6 + 3 = 9Prompt: Count each group.
- Which number sentence matches the story? Isla has 9 pencils. Daniel gives Isla 1 more. How many pencils does Isla have now? (9 + 2 = 11 / 9 + 1 = 10 / 9 − 1 = 8) → 9 + 1 = 10Prompt: Does the amount get bigger or smaller?
- Which number sentence matches the picture? ■ ■ ■ ■ ■ + ■ ■ ■ ■ (5 + 5 = 10 / 6 + 4 = 10 / 5 − 4 = 1 / 5 + 4 = 9) → 5 + 4 = 9Prompt: Count each group.
Hook · 5 min
- Give a real shopping total or a score difference and ask for a quick estimate first.
- Share the objective: Plus or minus? Choose the sign. 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: Which sign makes this true? 9 __ 1 = 10
- Step 1: 9 + 1 = 10
- Step 2: +
- Answer: +
- 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.
- Which sign makes this true? 7 __ 5 = 2 (+ / −) → −Prompt: Is 2 more or less than 7?
- Should you add or subtract? Sofia had 10 pencils. Sofia gave 6 to Tariq. How many pencils does Sofia have left? (Add (+) / Subtract (−)) → Subtract (−)Prompt: Are things joined together, or taken away?
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.
- Which sign makes this true? 5 __ 3 = 2 (+ / −) → −Prompt: Is 2 more or less than 5?
- Should you add or subtract? There are 3 shells on the table and 4 shells in a box. How many shells are there altogether? (Add (+) / Subtract (−)) → Add (+)Prompt: Are things joined together, or taken away?
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: Match a number sentence to a picture or story.
- 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