4 ms·

Multiplying by 9 is easy using your fingers (assuming you don't want to multiply by more than 10). http://www.youtube.com/watch?v=CVbcra3rCqc http://www.youtube

by mkmk 13y ago

Multiplying by 9 is easy using your fingers (assuming you don't want to multiply by more than 10). http://www.youtube.com/watch?v=CVbcra3rCqc http://www.youtube.com/watch?v=CVbcra3rCqc