Crack the Code: Comparing Numbers

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Crack the Code: Comparing Numbers

What do you already know about comparing numbers?

What Will We Learn Today?

At the end of the lesson you will be able to compare numbers up to 100 using symbols (<, >, =), represent numbers in different ways, and explain your reasoning with confidence.

Quick Starter: Retrieval

Count backwards from 80 to 65.

Question 1

Question 2

What is 10 more than 40? What is 10 less than 70?

"Which is more?" Reasoning

Sam says 42 > 24 because 4 is bigger than 2. Is Sam right? Explain your answer using Base-10 or Ten Frames. Think about how many tens and ones each number has.

Check: Find the Largest!

Circle the biggest number: 81, 18, or 88?

Representing & Proving Numbers

I have 3 tens and 5 ones. My friend has 5 tens and 3 ones. Who has the bigger number? Draw a Part-Whole Model to justify.

Check

Reasoning

True or False: 50 is made of 5 ones?

Finding the Odd One Out

You see: 36, a picture of 3 tens and 6 ones, and "six tens and three ones". Which does not match? Explain your choice by thinking about place value.

"One More/One Less" Mystery

I am thinking of a number. One more than my number is 61. What is my number? Use a 100 Square or number line to help find the answer.

Final Check: Quick Quiz

1. Write the number 'forty' in numerals. 2. What number comes between 46 and 48? 3. What is one less than 100?

Write down 3 things you learned in this lesson.

Write down 2 things you want to know more about.

Ask 1 question about something you haven't quite understood yet.