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Home > Stage 2 > Additive relations > Clap for your life - subtraction
Suggested content:
Suggested content:
Select strategies flexibly to solve addition and subtraction problems of up to 3 digits
Represent solutions to addition and subtraction problems, including word problems, using an empty number line or bar model
Apply known mental strategies that use partitioning to add and subtract, such as bridging the decades
Equipment
Equipment
Indoor or outdoor playing area
Whiteboard and marker
6 dice per pair
Pre-activity
Pre-activity
Begin with Number Talk: Let's talk 1
Students will need to be familiar with efficient mental and written strategies for subtraction
How to play
How to play
Players partition 3-digit numbers using physical exercises and use a number line to find the total.
Roll 6 die to make two 3-digit numbers.
Write the 2 numbers on the whiteboard.
Draw an empty number line on the whiteboard and write the largest number at the start of the number line.
Say the smallest number aloud and then demonstrate partitioning by throwing the ball in the air and clapping hands to model each unit value before catching again. Eg. for the number 985 students would need to throw the ball in the air and clap 9 times before catching, throw the ball again and clap 8 times and throw the ball a final time and clap 5 times.
Students use the empty number line to subtract.
Write the answer under the number line.
What other strategies could be used to solve the algorithm?
Variations
Variations
Change 3-digit numbers to 1, 2 or 4-digits.
Use fraction or decimal die.
Use pre-made number line with numbers marked.
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