Estimation Strategies

Question 1

Estimating by rounding pairs of numbers to numbers that are easy to add, subtract, multiply, or divide

Answer 1

Compatible numbers

Question 2

Estimating sums or products when all the numbers are close to a single value

Answer 2

Clustering

Question 3

Estimating by rounding to the greatest place value of the number in front
(Example: 412 + 58 + 1780 would become 400 + 60 + 2000, so the estimated value is 2,640)

Answer 3

Front-end estimation