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Multiplying decimals

Mathematics

Multiplying decimals

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 6 questions in an interactive multiple choice 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. 0.5 × 4 = ?

    • 2
    • 2.5
    • 20
    Read the explanation

    Four halves make two.

  2. 1.2 × 3 = ?

    • 36
    • 3.6
    • 3.2
    Read the explanation

    Three lots of one point two make three point six.

  3. 2.5 × 2 = ?

    • 5.5
    • 4.5
    • 5
    Read the explanation

    Two lots of two point five make exactly five.

Before you play

Game teaching guide

What children will practise

Practise multiplying and dividing decimals by whole numbers, following ค 1.1 ป.5/6 and ป.5/7, reasoning from meaning (0.5 × 4 is four halves) and placing the decimal point correctly.

What's in the worksheet

6 questions, multiple choice with 3 options - 0.5 × 4 (2) - 1.2 × 3 (3.6) - 6 ÷ 0.5 (12) - 0.1 × 10 (1) - 4.5 ÷ 3 (1.5)

How to use it in class

Use mid-way through decimal multiplication and division, before longer practice; about 5 minutes. - Play in teams and have each team estimate first, e.g. 1.2 × 3 should be near 3 - If many miss Q4, use 50-satang coins: how many make 6 baht? - For Q2 and Q6, check by estimating; options 36 and 15 are far too big - Play it linked to the class to record results in the mark book.

Common sticking points

- Q4: most children answer 3 for 6 ÷ 0.5, believing division always makes smaller; dividing by a number less than 1 makes it bigger - Q2: dropping the point gives 36, or multiplying only the ones digit gives 3.2 - Q6: 15 comes from 45 ÷ 3 without putting the point back

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

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