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The Kitti’s hog-nosed bat, or bumblebee bat, is one of the world’s smallest mammals. It typically weighs about kilograms and has a meter wingspan. A giant golden-crowned flying fox bat, on the other hand, typically weighs kilograms and has a wingspan of up to meters. Estimate about how many times heavier a flying fox bat is than a bumblebee bat, without using a calculator.

Compute without a calculator

Is the question about the mass (in kilograms) or the wingspan (in meters)?

This is about the mass (in kilograms).
So set up a ratio of the mass of the flying fox to the bumblebee bat.