Johnny says multiplication always makes numbers bigger explain to johnny why this isn't true give more than one example to him understand

This isn't always true because if you multiply by 1 the number will stay the same and if you multiply by zero it will be zero. 

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If you multiply any number by a decimal number, you WILL make it smaller, because if you multiply a number by something less than one, you will get something less than itself. This also works if you multiply a number by a fraction.

For example, 4 times 0.5 equals 2 because you are getting half of the original number which is 4

Also, it will work like this for a fraction:
6 times 2/3 is 4.

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