\(\mathbb N\): The set of natural or counting numbers 0, 1, 2, 3, etc. Some say this set does not include zero.

\(\mathbb Z\): The set of integers. This set is the same as the set of natural numbers but includes the negative whole numbers.

\(\mathbb Q\): The set of rational numbers. These are the numbers that can be expressed as a proper fraction or one integer divided by another.

\(\mathbb R\): The set of real numbers. That is probably all the numbers you know unless you have studied the topic of Complex Numbers.

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$$\mathbb R$$

$$\mathbb Q$$

$$\mathbb Z$$

$$\mathbb N$$

\(\text{one million}\)

\(\frac34\)

\(\cos 40^o\)

\(\pi\)

\(\sin 30^o\)

\(-\sqrt9\)

\(\frac{57}{9}\)

\(\frac23\)

\(\sqrt2\)

\(1.\dot4\dot2\)

\(\frac12\div\frac12\)

\(7\)

\(-2.479315...\)

\(1.3\)

\(1\div6\)

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#### Pentransum

Answer multiple choice questions about basic mathematical ideas. If you get a number of questions correct you will be invited to post a question of your own. The bank of questions grows larger every day.

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Drag the numbers into the correct sets as shown in the Venn diagram above. When you have finished click on the 'Check' button above.

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#### Telling The Time

Practise reading a clock face and solving problems involving converting between units of time. So far this activity has been accessed 19726 times and 2666 people have earned a Transum Trophy for completing it.

Strange But True,

Monday, August 5, 2019

"Most natural numbers are very, very large!"