Skip to content
Krufahda
Checking account…
Prime factors, minutes and percentages

Mathematics

Prime factors, minutes and percentages

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 matching activity.

Curriculum indicatorค 1.1 ป.5/4

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. Match each number to its prime factorisation.

    • 8
    • 12
    • 18
    • 30
    Read the explanation

    Break it down until only primes are left.

  2. Match each length of time to its number of minutes.

    • 1 hour
    • 1 and a half hours
    • 2 hours
    • 2 and a half hours
    Read the explanation

    Turn hours into minutes by multiplying by sixty.

  3. Match each fraction to its percentage.

    • 1/5
    • 2/5
    • 3/5
    • 4/5
    Read the explanation

    Multiply a fraction by a hundred to get the percentage.

Before you play

Game teaching guide

What children will practise

Match numbers to their prime factorisations, convert hours to minutes, turn fifths into percentages, and name polygons by their number of sides.

What's in the worksheet

4 matching rounds of 4 pairs each - Prime factors: 8 with 2 × 2 × 2, 18 with 2 × 3 × 3, 30 with 2 × 3 × 5 - Time to minutes: 1 and a half hours with 90, 2 and a half hours with 150 - Fraction to percentage: 1/5 with 20%, 3/5 with 60% - Shape to sides: octagon with 8, decagon with 10

How to use it in class

Use as a short end-of-lesson game after factors; about 4 minutes. - Play as a class on the projector; in round 1 have children multiply the options out before matching - For round 3, teach the shortcut that 1/5 is 20%, then multiply by 2, 3 and 4 - If round 1 goes badly, draw factor trees for 12 and 18 on the board - Play it linked to the class to record results in the mark book.

Common sticking points

- Round 1: 12 and 18 are easily swapped since both use 2 and 3; count how many 2s and 3s - Round 2: an hour and a half may be treated as 1.5 × 100; stress that half an hour is 30 minutes - Round 4: decagon is unfamiliar in English, though in Thai the number is in the name

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

More games to try

More games from the same subject for the lesson you are planning.

See all games
Prime factors, minutes and percentages — AR game for Grade 5 | Krufahda