Practise · Estimate it
Guess first. Then build the number.
Seal a quick guess and one line on why. Only then do the parts of the estimate open.
How many slices of pizza does a town of 50,000 people eat in a week?
Your sealed guess
Now build it from parts
Move each part to what you believe. No part is the right answer.
People in the town 50,000
Built from parts 45,000 slices a week
Which part moves the result most? That is the one to check first.
How many haircuts does a town of 50,000 people get in a month?
Your sealed guess
Now build it from parts
Move each part to what you believe. No part is the right answer.
People in the town 50,000
Built from parts 20,000 haircuts a month
Which part moves the result most? That is the one to check first.