Lesson: Estimating Products of Two-Digit Numbers: Compatible Numbers Mathematics • 4th Grade

In this lesson, we will learn how to estimate the product of multiplying two-digit numbers by using compatible numbers.

Lesson Plan

Students will be able to

understand that there are multiple ways to estimate products of two-digit numbers,
estimate products of two-digit numbers by replacing the factors with compatible numbers that are easy to multiply,
understand that sometimes replacing the factors with compatible numbers gives a better estimate than rounding them to the nearest ten.

Q1:

Using compatible numbers, we can estimate the result of as follows:

Fill in the blank: The estimated product is .

Q2:

Which of the following is an estimate for using compatible numbers?

Q3:

Which of the following is an estimate for using compatible numbers?