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Primes, percentages and finding the LCM

Mathematics

Primes, percentages and finding the LCM

An AR classroom game for Grade 5. 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.5/3

PlayHost 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.

  1. Put the prime numbers in order from smallest to largest.

    • 2
    • 3
    • 5
    • 7
    Read the explanation

    The first four primes are two, three, five and seven.

  2. Put the times in order from shortest to longest.

    • 1 hour
    • 2 hours
    • 30 minutes
    • 90 minutes
    Read the explanation

    Convert them all to minutes before comparing.

  3. Put the percentages in order from smallest to largest.

    • 10%
    • 25%
    • 50%
    • 75%
    Read the explanation

    Percentages can be compared directly.

Before you play

Game teaching guide

What children will practise

Order the first four primes, order times written in different units, order percentages, and put the steps of finding the lowest common multiple by listing multiples in order.

What's in the worksheet

4 ordering rounds of 4 cards - Primes smallest first: 2, 3, 5, 7 - Shortest to longest: 30 minutes, 1 hour, 90 minutes, 2 hours - Percentages smallest first: 10%, 25%, 50%, 75% - Steps for the LCM: list multiples of the first number, list multiples of the second, find the shared ones, take the smallest

How to use it in class

Use as a warm-up before teaching the LCM; about 4 minutes. - Play as a class on the projector and use round 4 as the lead-in, working 4 and 6 on the board after the answer - In round 2, have children convert every card to minutes first - After round 1, ask whether 1 is prime and why it is not in the set - Play it linked to the class to record results in the mark book.

Common sticking points

- Round 2: 90 minutes may be put after 2 hours because 90 is a big number, if units are not converted - Round 4: listing the multiples of the first and second numbers can be done in either order, so children who swap them may lose marks - Round 1: some think 2 is not prime because it is even

Play together first, then build on it with a worksheet for the same level.

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