# Package 5-2 Strike it Out! Let’s Investigate

This activity will allow you to explore the game Strike It Out and then investigate some of the strategies more deeply.

# Things you need

Ideal Back up

3 coloured pencils or markers

Paper

# Why is this activity important?

Strike it Out! Let’s investigate is a great activity to enhance skills in reasoning, working collaboratively and applying knowledge of additive strategies. The game is easily adaptable for a broad range of learners, also allowing you to do some deep investigations around winning strategies and using all of the numbers along the number line.

# Before you start

• Read the guiding questions below.

• Have all the required materials ready to go.

• Make sure the video link is working.

# What your child needs to know and do

Watch the video Strike it out. This video is the same video for Strike it Out! Let’s Play

# What to do next

• Play Strike it out! Again. (Instructions below)

• 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.

• Now that you’ve had an opportunity to play a few games, choose a few questions to investigate more deeply.

• What are some of the strategies you use to try to help you win?

• Were you able to win every time you played?

• What different moves could have been done to have crossed out more numbers?

• Can all of the numbers on the number line be used in the same game?

• Did you notice anything about 0?

• What if the number line went from 0 – 19, or, from 1 – 20... could all the numbers be crossed out then? What could the game look like...what could the moves be?

• What if you could use multiplication and division... test it out and see how that changes the game.

Activity too hard? Activity too easy?

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

Watch the videos again and play the game multiple times.

Use different number lines.

Investigate using all four operations (addition, subtraction, multiplication and division).

Ask your child to determine the ultimate game where all of the numbers on the number line are able to be crossed out.

• What are some of the strategies you use to try to help you win?

• Were you able to win every time you played?

• What different moves could have been done to have crossed out more numbers?

• Can all of the numbers on the number line be used in the same game?

• Did you notice anything about 0?

• What if the number line went from 0 – 19, or, from 1 – 20... could all the numbers be crossed out then? What could the game look like...what could the moves be?

• What if you could use multiplication and division... test it out and see how that changes the game.