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Value Detectives: Place Value!

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Lesson Plan

Value Detectives: Place Value!

Students will be able to identify the value of digits in two-digit numbers (tens and ones).

Understanding place value is a foundational skill for all future math concepts, including addition, subtraction, and larger number comprehension.

Audience

1st Grade Students

Time

15 minutes

Approach

Hands-on activities and visual aids to build conceptual understanding.

Materials

Value Detectives: Place Value! Slide Deck, and Place Value Practice Worksheet

Prep

Gather Materials & Review

5 minutes

Step 1

Warm-Up: Mystery Number

2 minutes

  • Ask students: "What's bigger, 1 ten or 9 ones?" Discuss their answers briefly.
    - Introduce the idea that where a digit sits in a number changes its 'value' or 'power'.

Step 2

Introduction: Tens and Ones Talk

3 minutes

Step 3

Guided Practice: Build a Number

5 minutes

  • Use manipulatives (e.g., base ten blocks) to demonstrate building a two-digit number, like 23 (2 tens and 3 ones).
    - Have students practice building a few numbers (e.g., 17, 34) with their own manipulatives, articulating the tens and ones.

Step 4

Independent Practice: Worksheet Time

4 minutes

  • Distribute the Place Value Practice Worksheet.
    - Guide students through the first question, then allow them to complete the remaining questions independently.

Step 5

Cool Down: Quick Check

1 minute

  • Ask students to quickly write down a number and identify how many tens and ones it has.
    - Collect the worksheets and provide positive feedback.
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Slide Deck

What's in a Number?

Every number has a secret!
What makes 10 different from 1?
It's about where the numbers live!

Welcome students and get them thinking about numbers. Ask them what they notice about numbers like 10, 20, 30. How are they different from 1, 2, 3?

Tens and Ones: Our Number Buddies

Numbers are built with...
TENS (groups of 10)
ONES (single items)

Introduce the concept of tens and ones using visual examples like base ten blocks or bundles of sticks. Emphasize that a 'ten' is a group of 10 'ones'.

Let's Build 23!

23 has:
2 tens (that's 20!)
3 ones (that's 3!)
20 + 3 = 23!

Show an example, like the number 23. Break it down into 2 tens and 3 ones visually. Ask students to count along.

How about 17?

17 has:
1 ten (that's 10!)
7 ones (that's 7!)
10 + 7 = 17!

Show another example, like the number 17. Break it down. Have students articulate the tens and ones.

Your Turn, Value Detectives!

What numbers can you build?
Show me 12!
Show me 31!
Show me 40!

Encourage students to practice building numbers with their manipulatives, reinforcing the concept before they move to the worksheet. Say: 'Time to be a Value Detective! What numbers can you build?'

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Worksheet

Place Value Practice: Tens and Ones!

Name: _____________________________

Directions: Look at each number. Write how many tens and how many ones are in the number.

  1. Number: 15
    How many Tens? _________



    How many Ones? _________


  1. Number: 28
    How many Tens? _________



    How many Ones? _________


  1. Number: 30
    How many Tens? _________



    How many Ones? _________


  1. Number: 42
    How many Tens? _________



    How many Ones? _________


  1. Challenge! Number: 19
    Draw 19 using tens and ones blocks (or circles and lines):












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Answer Key

Place Value Practice Worksheet Answer Key

Directions: Look at each number. Write how many tens and how many ones are in the number.

  1. Number: 15
    How many Tens? 1 Ten



    How many Ones? 5 Ones


  1. Number: 28
    How many Tens? 2 Tens



    How many Ones? 8 Ones


  1. Number: 30
    How many Tens? 3 Tens



    How many Ones? 0 Ones


  1. Number: 42
    How many Tens? 4 Tens



    How many Ones? 2 Ones


  1. Challenge! Number: 19
    Draw 19 using tens and ones blocks (or circles and lines):
    Drawing should show one group of ten (e.g., a long block or 10 connected circles) and nine single ones (e.g., small circles or dots).











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Value Detectives: Place Value! • Lenny Learning