Week 2 - Package 1 - Year 3 & 4 Mathematics - Strike it Out

This activity is a great way to increase skills in reasoning, working collaboratively, and applying knowledge of strategies used to add and subtract.

Week 2 - Package 1 - Year 3 & 4 Mathematics - Strike it Out

Things you need

Have these things available so your child can complete this task

Ideal Back up

3 coloured markers or pens

Coloured pencils

Plain Paper



Why is this activity important?

This activity is a great activity to increase skills in reasoning, working collaboratively, and applying knowledge of strategies used to add and subtract. The game can easily be played with learners having different skill levels, also allowing you to investigate winning strategies and using all the numbers along the number line.

Before you start

The game requires mathematical thinking and the child should be given sufficient time to think during each turn.

  • Gather the materials needed

What your child needs to know and do

Watch the video Strike it out.

What to do next

  • Draw a number line 0 to 20.

  • The first player chooses a number on the line and crosses it out.

  • The same player then chooses a second number and crosses that out too.

  • Finally, he or she circles the sum or difference of the two numbers and writes down the calculation.

  • For example, the first player’s go could look like this:

  • The second player must start by crossing off the number that player 1 has circled.

  • He or she then chooses another number to cross out and then circles a third number which is the sum or difference of the two crossed-off numbers

  • Player 2 also writes down their calculation.

  • For example, once the second player has had a turn, the game could look like this:

  • The winner of the game is the player who stops their opponent from being able to have a go.




Options for your child

Activity too hard? Activity too easy?

Provide the child with counters / blocks to work out options.

Explore different number lines.Include multiplication and division.

Follow-up questions to ask your child

What could you have differently?

Is there a strategy you can use to make it harder for your opponent?

Is there another number sentence you could make with the same numbers? How would that change the game for your opponent?

Extension/Additional activity

They could play Strike it Out! Let’s Investigate.


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