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Rounding numbers

Mathematics

Rounding numbers

An AR classroom game for Grade 4. 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.4/7

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. Round 47 to the nearest ten.

    • 50
    • 45
    • 40
    Read the explanation

    The ones digit is seven, which is more than five, so round up to fifty.

  2. Round 32 to the nearest ten.

    • 35
    • 30
    • 40
    Read the explanation

    The ones digit is two, which is less than five, so round down to thirty.

  3. Round 250 to the nearest hundred.

    • 250
    • 200
    • 300
    Read the explanation

    Exactly fifty, and the rule is to round up - three hundred.

Before you play

Game teaching guide

What children will practise

Round numbers to the nearest ten, hundred and thousand, including the exactly-halfway case, and use rounding to estimate a sum (indicator ค 1.1 ป.4/7).

What's in the worksheet

6 multiple-choice questions - 47 to the nearest ten is 50; 32 is 30 - 250 to the nearest hundred is 300; distractors 250 and 200 - 1,234 to the nearest thousand is 1000; distractor 1200 - 89 to the nearest ten is 90 - Estimate 48 + 31: 80

How to use it in class

Use after teaching rounding with a number line, about 6 minutes, team mode, with a number line on the board. - 250 is exactly halfway; let teams discuss before revealing, then settle the rule that halfway rounds up - For 1,234, the distractor 1200 is rounding to the hundred; ask which place the question asked for - For the estimate, teams also work out the exact 79 and compare - Play it linked to the class to record results in the mark book

Common sticking points

- Choosing 200 for 250, thinking halfway rounds down, or 250 by not rounding at all - Choosing 1200 for 1,234 by rounding to the hundred out of habit. Underline "thousand" - Choosing 45 for 47, rounding to the nearest number ending in 5

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

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