Games with Operations

For teachers

These activities are developed to engage students in a discussion. Put an activity in full-sreen mode and give students some time to think before the discussion.

A fun story about arithmetic operations

Playing with parenthesis

For teachers

One needs to place parentheses at appropriate locations to obtain a correct mathematical expression. According to mathematical rules, only necessary parentheses should be used. For example, parentheses are necessary in expressions like (2+4)×5, while they are unnecessary in expressions like 2+(4×5).

Cross-expressions

Playing with operations

Among the calculation strategies, which ones are equivalent to the given expression?
Compare the correct strategies. Which one seems the easiest to calculate to you?
Why are the other strategies not correct?