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Odd and even sums and products

Mathematics

Odd and even sums and products

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 1.1 ป.2/1

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. Sort the numbers into groups.

    Sort into

    • even
    • odd
    • 24
    • 37
    • 50
    • 63
    Read the explanation

    Even numbers end in 0, 2, 4, 6 or 8; odd numbers end in 1, 3, 5, 7 or 9.

  2. Sort the sums by their answers.

    Sort into

    • the answer is even
    • the answer is odd
    • 2 + 4
    • 3 + 4
    • 5 + 5
    • 6 + 7
    Read the explanation

    Even plus even is even, odd plus odd is even, but even plus odd is odd.

  3. Sort the numbers into groups.

    Sort into

    • less than 30
    • more than 30
    • 18
    • 45
    • 29
    • 72
    Read the explanation

    Compare the tens digit with three - fewer than three tens means less than thirty.

Before you play

Game teaching guide

What children will practise

Sort odd and even numbers (indicator ค 1.1 ป.2/1), notice that even plus odd gives odd, compare numbers with 30, and work out products in the 2 and 5 times tables to compare with 20.

What's in the worksheet

4 sorting questions with 2 boxes each - 24 and 50 are even; 37 and 63 are odd - 2 + 4 and 5 + 5 give even answers; 3 + 4 and 6 + 7 give odd answers - 18 and 29 are less than 30; 45 and 72 are more - 2 × 5 and 2 × 8 are less than 20; 5 × 6 and 5 × 9 are more

How to use it in class

Use after teaching odd and even, 6-8 minutes. Team mode suits it: teams discuss before dragging. - For sums, work out the answer first, then look at the ones digit. Then use 5 + 5 to notice that odd plus odd gives even - For products, allow counting up in fives on paper - Play it linked to the class to record results in the mark book

Common sticking points

- Putting 5 + 5 under odd because 5 is odd. Work out the sum, 10, first - Judging 63 as even because of the 6. Cover the tens digit and look only at the ones - Guessing 2 × 8 or 5 × 6 from the digits shown when the 5 times table is not secure. Count up in fives

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

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Odd and even sums and products — AR game for Grade 2 | Krufahda