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Start by putting one million ($1 000 000$) into the display of your calculator.
Can you reduce this to $7$ using just these six buttons - the $7$ key and add, subtract, multiply, divide and equals as many times as you like?
What is the shortest way can you find to do it?
After they have found at least four ways of doing this, learners could try Two and two or even the Stage 3 problem Arrange the digits.
Suggest using a simple calculator and experimenting quietly to see what happens or doing this two digit activity.