Math lesson plan · Kindergarten (Reception and Year 1 in England) · 30 minutes
Missing numbers on a hundred square
Number sense
CCSS K.CC.A.1CCSS K.CC.A.2England: Y1 Number and place value
Objective and success criteria
Students will: Missing numbers on a hundred square.
- 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: Count to 100 by ones and tens
Leads to: Move around a number grid to 120
Materials: Place value chart, Base-ten blocks or a number line, Mini whiteboards and pens, Printed student sheet (below).
Warm-up · 4 min
- Quick retrieval from earlier learning (Count to 100 by ones and tens). Students answer on mini whiteboards.
- Show answers together and note who needs support in the main task.
- Count by tens. What is missing? 60, 70, __, 90, 100 → 80Prompt: Each number is 10 more than the one before.
- Count by tens. What is missing? 50, 60, __, 80, 90 → 70Prompt: Each number is 10 more than the one before.
- Count by tens. What is missing? 40, __, 60, 70, 80 → 50Prompt: Each number is 10 more than the one before.
Hook · 3 min
- Show a number in the news or a price tag and ask what each digit is worth.
- Share the objective: Missing numbers on a hundred square. Read the success criteria together.
I do: model it · 7 min
- Work through the example out loud, saying why you do each step, not just what you do.
- Example: This is a row of the hundred square. Which number is missing? 31, 32, 33, 34, 35, __, 37, 38, 39, 40
- Step 1: 35 + 1 = 36
- Step 2: 36
- Answer: 36
- Pause after each step and ask a student to say what comes next.
We do: guided practice · 6 min
- Do these together. Students try each step on whiteboards before you reveal it.
- Use the hints as prompts rather than giving the answer.
- This is a row of the hundred square. Which number is missing? 81, 82, 83, 84, 85, 86, 87, __, 89, 90 → 88Prompt: Along a row, the numbers go up by one.
- What number comes just before 30? → 29Prompt: Just before a ten number, the ones digit is 9.
You do: independent practice · 7 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 6 questions are on the student sheet below, with answers in the key.
Exit ticket · 3 min
- Two questions on their own. Sort answers into got it / nearly / not yet to plan the next lesson.
- What number comes just after 40? → 41Prompt: After a ten number, the ones start again at 1.
- Fill in the missing number: 38, __, 40, 41 → 39Prompt: Count on by ones.
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: Count to 100 by ones and tens.
- 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: Move around a number grid to 120.
- 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