 Place value- compare and order decimal numbers with 1 or 2 decimal places

# Place value- compare and order decimal numbers with 1 or 2 decimal places

Place value- compare and order decimal numbers with 1 or 2 decimal places

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## General

Students learn to compare and set decimal numbers with the same amount of decimal places in numerical order. They know when a number is greater than or less than a given number.

## Relevance

Discuss with students why it is useful to be able to compare decimal numbers and set them in numerical order. Say that you can use this to determine the most expensive product and can compare your saved money to the price of the object. Do you have enough money?

## Introduction

The interactive whiteboard has a few exercises. They first must add two sums. They must then set the totals into the decimal place value chart and then place those numbers on the number line. Ask students to do these exercises on their own sheets of paper, and ask the students for answers by turns.

## Development

Show students the decimal place value chart and use the chart to explain that you can compare decimal numbers. By comparing the tens, ones, tenths and hundredths you can determine which number is greater or smaller. Explain that you can also use the decimal place value chart to set the numbers in numerical order. Show this with an example. As a class, determine the numerical order for a set of numbers and determine which decimal number is greater or less. Erase the boxes to show the answers.

Check that students can compare decimal numbers with 1 or 2 decimal places and set them in numerical order by asking the following questions/giving the following exercises:
- When is one decimal number greater than another decimal number?
- How do you know if a decimal number is greater than or less than your number
- How do you know which decimal number is the smallest or greatest in a sequence?
- Write a decimal number that is less than 5.3..
- Write a decimal number that is greater than 6.78.

## Guided practice

The students first practice with decimal numbers that are very far apart in value to check understanding of greater than or less than. Next they practice greater than or less than with decimals that are closer to each other in value. They then practice setting decimal numbers in order from greatest to least and from least to most.

## Closing

Discuss with students that it is important to be able to compare decimal numbers and set them in numerical order so you can compare products (to see which is most expensive) and to see if you can purchase an object with your saved money. Check that students know to use a decimal place value chart to help them. To check that students understood, the students must write decimal numbers with 1 and 2 decimal places that are greater than 6.32. Next they must write a decimal number that is greater than and less than 4.2. They then must set all their written decimal numbers in numerical order from greatest to least.

## Teaching tips

Students who have difficulty comparing decimal numbers and setting them in numerical order can practice using the decimal place value chart. By filling in the numbers in this chart they can see which number is greater or less than the other number. 