This is a level 4 number activity from the Figure It Out series. It relates to Stage 7 of the Number Framework.
A PDF of the student activity is available.
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add and subtract decimals
A calculator
A different coloured counter for each player
Set A and Set B cards on Copymaster
FIO, Level 3, Number, Book 2, Dallying with Decimals, page 17
Dice labellled 1,1, 2, 2, 3, and 3
Classmate
Game
This is another game that provides a fun context to practise addition and subtraction of decimals and opportunities for the students to explore and share additive strategies for decimals.
Note that the dice is restricted to the numbers 1, 2, and 3. This increases the likelihood of the students hitting a star, which is where the purpose of the game is fulfilled. If you cannot access a dice like this, use an ordinary one and tell the students to subtract 3 if they throw a 4, 5, or 6.
It would be a good idea to use two colours to make up the different sets of cards. This helps with the organisation of the game.
Once the game has been taught and practised, it will become a useful independent activity. You may also use it for strategy teaching by asking the students to reflect on how they did some of the star calculations.
If the students need assistance with the decimal calculations, have them use the blank decimal fraction number lines (Material Master 4-25).
Answers to Activity
Game
A game for adding and subtracting decimals