Get the bean bag

Select strategies flexibly to solve addition and subtraction problems of up to 3 digits

Apply known mental strategies that use partitioning to add and subtract, such as bridging the decades
Use the compensation strategy to add and subtract (Reasons about relations)
Apply the levelling and constant difference strategies (Reasons about relations)
Represent solutions to addition and subtraction problems, including word problems, using an empty number line or bar model
Compare and evaluate strategies used to solve addition and subtraction problems, reasoning which strategy may be most efficient

Each team has a hoop.
Place a large collection of counters or beanbags in a hoop in the middle of a large, flat surface.
Inform students of the value of each of the coloured counters or beanbags, eg. Red - 1, Yellow - 5, Green - 10.

Teams race to collect bean bags to make a target number.

Identify number to make, eg. 152.
Players take turns to roll two dice, add the total and run to get the number of bean bags to build up to their target number. Place beanbags in hoop.
Continue until a team gets the exact roll to complete their total.
Teams call out 'stop' when they have reached their total.
Talk about how many you have, how many more you need, what strategies you used, and so on.
Reflect and discuss:
- If you were to play the game again tomorrow, what is one thing you would do differently? Why?
- Draw a picture that shows how you made your total.

Play in reverse. Make the number first and take away beanbags each time until there are no beanbags left.
Make more than one number total, eg. Hoop 1 = 10, Hoops 2 = 15.
Change the number total, eg. 1000, and include beanbag with value of 100.

Additive relations