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A petri dish originally contained 140 bacteria. A scientist let the bacteria grow and now there are 870 of them. How many more bacteria are there now?

Question

A petri dish originally contained 140 bacteria. A scientist let the bacteria grow and now there are 870 of them. How many more bacteria are there now?

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Solution

To find out how many more bacteria are there now, you need to subtract the original number of bacteria from the current number. Here are the steps:

  1. Write down the current number of bacteria: 870
  2. Subtract the original number of bacteria: 140

So, 870 - 140 = 730

Therefore, there are 730 more bacteria now.

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