Mathematics for IGCSE & O level - Estimation (Section 1 - No. 15)
What is the best approach to estimate the total cost of 7 items that cost $3.89 each?
Use a calculator to find the exact cost
Round each item to $4 and multiply.
Round each item to $3 and multiply.
Add the items then divide by 7
Giải thích
Rounding $3.89 to $4 is a good approach to provide an easy estimate.