unit-2-the-world-of-numbers

Unit-2 The World of Numbers

This unit puts light on the invention of numbers, origin of these numbers and how old are they.

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Suppose the temperature of a cooling substance is 10 ◦C at a particular time and suppose there is a drop in temperature by 5 ◦C in every 10 minutes. By how much will the temperature have dropped after 40 minutes? Use a number line to find this.


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