We can use the rounding method to round 65 and 54 to the nearest ten digits and multiply to get an estimate.
Given two numbers: 65 and 54
Round each number to the nearest ten digits:
65 Round to the nearest ten digits to 60
54 Round to the nearest ten digits to 50
Multiply the two numbers to get an estimate:
60 \times 50=3000
60×50=3000
So 65×54 is about 3000
It should be equal to 3510, not approximately