Question

a petri dish contained 6,642 bacteria. a scientist let the bacteria grow until there were 1,179 more of them. how many bacteria are there now?

Explanation:

Step1: Identify initial and final number

Initial number of bacteria is 6642, final number is 1179.

Step2: Calculate difference

To find how many more bacteria there are now, we subtract the final number from the initial number. So, $6642 - 1179$.
$6642-1179 = 5463$

Answer:

5463