Question

A dollar bill weighs about 1gram.Use this information to estimate the number of dollar bills it would take to weigh 1 kilogram

Answer 1

To answer you question, the answer should be 1️⃣0️⃣0️⃣0️⃣ because if each dollar bill weighs 1 gram and there are 1000 grams
in a kilogram that would mean it would take 1️⃣0️⃣0️⃣0️⃣ dollar bills to make a kilogram.

Hope this help.
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Answer 2

The prefix "kilo" means 1,000.  Therefore, we can infer that one kilogram has 1,000 grams.