Which number makes this sentence true? 7.8×3.6×1=7.8×? 1,3.6,4.6,7.8
1 answer:
In the left hand side, you're multiplying 7.8 by 
In the right hand side, you're multiplying again 7.8 by a mysterious number.
So, the unknown number must be 
Every number remains unchanged when multiplied by 1, so the answer is 3.6
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