Three Numbers Arithmetic
Make the target number using three numbers with any operations.
The numbers used must share a corner or a side and be used in order.
Click ‘next’ for a new target. There are 50 target number cards. Click ‘shuffle board’ for a new board and new target.
GeoGebra Link game
GeoGebra Link to print board
Example: Here are five different ways the number 13 could be found on this board:
More game ideas:
Speedy Eight
2 players. You need a dice, two colours, a printed grid.
Before you begin: Each player writes a list of 8 numbers between 1 and 50 for the other player to find.
To begin: roll the dice to decide who is the active player first. The highest goes first.
To play: The active player looks for any of their eight numbers, using three numbers as described above, and colours them in on the grid. Once a tile has been used it cannot be used again.
The other player rolls the dice until they roll a six. When they roll a six, they become the active player. The first person to find all eight of their numbers wins.
Collaborative
- Print a number grid. Write down the numbers 1 – 50. See how many you can find on the grid without repeating any square on the grid.
- Print a number grid. Write down the first 10 numbers cards shown above. See how many can be found such that the squares used do not overlap.
Another arithmetic classroom game, using mini whiteboards:
One whiteboard between 2 or 3. Students should have access to a multiplication table but not a calculator. Goal: Gain points by thinking of good ways to make a random number using 1 – 12, repeats ok.
Teacher – chooses a number between 20 and 60. Example: 45
Each student team writes three calculations. Calculations must begin with a multiply and end with an add or subtract, Example:
- $8 \times 5 + 5=45$
- $12\times 4 – 3=45$
- $6\times 7 + 3=45$
Points are awarded as follows:
1 point if you wrote the calculation that showed up most often (can be bi-modal or tri-modal…);
2 points for every calculation that you wrote that no other group did;
0 points for any other calculation.
Check answers by asking one table to read out their three calculations. There will only be about 5 teams, so go through until all calculations have been read out.
Play as many rounds as you like, 5 rounds would be alot I think. Probably on round 2, disallow the use of the number 10.