A special clock for American Independence Day. It only uses the digit 4.
Can you design a special clock for a different day of the year using a different digit?
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Topics: Starter  Arithmetic  Investigations  Problem Solving
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There are of course many ways pupils might respond to this challenge but here is an example of a solution
$$1=\left(\frac{9}{9}\right)^9$$
$$2=\left(\frac{9+9}{9}\right)$$
$$3=\sqrt{9}+99$$
$$4=\sqrt{9}+\frac{9}{9}$$
$$5=\sqrt{9}!\frac{9}{9}$$
$$6=\sqrt{9}\times\sqrt{9}\sqrt{9}$$
$$7=\sqrt{9}!+\frac{9}{9}$$
$$8=9\frac{9}{9}$$
$$9=9+99$$
$$10=9+\frac{9}{9}$$
$$11=99\div9$$
$$12=9+\frac{9}{\sqrt{9}}$$
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Here a concise URL for a version of this page without the comments.
Here is the URL which will take them to a related student activity.
Here is the link to the pairs game based on AmericanEnglish and BritishEnglish mathematical words.
Transum.org/go/?to=MathvsMaths
Here is a visual aid for teachers to use when teaching alalogue time.