Mathematics

Units of length

An AR classroom game for Grade 2. Learners can aim with their hands at the camera or play by tapping the screen.

This set has 4 rounds in an interactive sorting activity.

Curriculum indicatorค 2.1 ป.2/2

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
Sort the things by the unit you would measure them in.
Sort into
- measured in centimetres
- measured in metres
- a pencil
- the height of a room
- an eraser
- the length of a football pitch
Read the explanation
Small things are measured in centimetres; large things and long distances in metres.
02
Sort the numbers into groups.
Sort into
- less than 50
- more than 50
- 23
- 78
- 41
- 95
Read the explanation
Compare each with fifty - below goes in the first group, above in the second.
03
Sort the answers into groups.
Sort into
- the answer is even
- the answer is odd
- 2 × 5
- 3 + 4
- 6 + 6
- 5 + 4
Read the explanation
Work out the answer first, then look at the ones digit to see if it is even or odd.

Before you play

Game teaching guide

What children will practise

Choose a sensible unit: centimetres or metres for length (indicator ค 2.1 ป.2/2), grams or kilograms for weight (ค 2.1 ป.2/4), with review of comparing to 50 and odd or even answers.

What's in the worksheet

4 sorting questions with 2 boxes each - A pencil and an eraser in centimetres; the height of a room and a football pitch in metres - 23 and 41 are less than 50; 78 and 95 are more - 2 × 5 and 6 + 6 give even answers; 3 + 4 and 5 + 4 give odd ones - One biscuit and a pen in grams; a large sack of rice and a student in kilograms

How to use it in class

Use to close a measurement lesson, about 6 minutes. In team mode, ask each team to explain one choice. - Beforehand, have pupils look at 1 cm on a ruler and stretch their arms to show roughly 1 metre - For weight, if you have scales, weigh a real pen to show it is only a few grams - Q2 and Q3 are number review, not measuring; warn pupils so they are not thrown - Play it linked to the class to record results in the mark book

Common sticking points

- Choosing centimetres for the height of a room, since pupils have seen people's height in cm. Point out a room is several metres tall and the number in cm would be huge - Putting "one student" under grams. Ask what unit the school nurse uses when weighing them - Placing 2 × 5 under odd because of the 5, without working out 10 first