Using only these keys on your calculator make each of the target numbers on the balloons. Use the fewest number of key presses possible.
16
24
97
624
Congratulations. You did it with 0 button presses.
Can you do it using a smaller number of button presses?
You could also try the Flash version which uses a different type of calculator.
Topics: Starter  Arithmetic  Calculator  Place Value  Problem Solving
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Previous Day  This starter is for 28 September  Next Day
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Teacher, do your students have
access to computers? 

Here a concise URL for a version of this page without the comments.
Transum.org/go/?Start=September28
Here is the URL which will take them to a calculator workout.