Mathematics

Comparing three-digit numbers

An AR classroom game for Grade 3. Learners can aim with their hands at the camera or play by tapping the screen.

This set has 4 rounds in an interactive ordering activity.

Curriculum indicatorค 1.1 ป.3/2

Play Host a classroom

A look before you play

Sample questions

A few real prompts from the game to help you choose an activity for your class.

01
Put them in order from smallest to largest.
- 18
- 45
- 72
- 96
Read the explanation
Compare the largest place first; if they match, move to the next.
02
Put them in order from smallest to largest.
- 112
- 245
- 310
- 87
Read the explanation
A three-digit number is always bigger than a two-digit one - count the digits first.
03
Put the steps of comparing numbers in order.
- compare the largest place
- count how many digits each number has
- if they match, move to the next place
- say which number is bigger
Read the explanation
Count the digits first - more digits already means bigger, with no need to compare each one.

Before you play

Game teaching guide

What children will practise

Compare and order two- and three-digit numbers (indicator ค 1.1 ป.3/2) by counting digits first and then comparing from the leftmost place, and put the comparison steps themselves in order.

What's in the worksheet

4 ordering questions - 18, 45, 72, 96 smallest to largest - 87, 112, 245, 310 mixing two- and three-digit numbers - Steps: count the digits, compare the largest place, if they match move to the next place, say which is bigger - 512, 534, 551, 578 share the hundreds, so the tens decide

How to use it in class

Use at the start of the numbers-to-100,000 unit, about 5 minutes, team mode. - Q3 orders the steps; have teams use those steps aloud to explain Q4 - For 87 and 112, ask "87 has bigger digits, so why is 112 larger?" - Extend by having teams make three-digit numbers from digit cards and order them - Play it linked to the class to record results in the mark book

Common sticking points

- Placing 87 after 112 because 8 is bigger than 1. Always count the digits first - In the steps question, putting "compare the largest place" before "count the digits", from habit with numbers of equal length - For 512 to 578, looking at the ones instead of the tens and putting 551 before 534