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Fun with maths!

To do this activity you need shockwave installed on your computer.
Click here for a free download

Drag the numbers on top of each other to add.
Use the fist to break up the numbers
umeracy site
More about the number 45
The sum of 1+2+3+4+5+6+7+8+9 = 45

Also

Multiply 123456789 by 2 and you get 246913578 , the sum of which is 45

Divide 123456789 by 2 and you get 61728394.5, the sum of which is 45

 

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Stuff Media specialise in designing maths activities on the www for clients including the BBC and British Telecom.