YourTeacher.com - Your Personal Math Teacher Inside Every Lesson

Demo Lesson!

Borough of Manhattan Community College

Pre-Algebra: Lesson 056

Addition and Subtraction
Estimating Sums and Differences

Lesson Description

Students learn to estimate the sum or difference of two decimals by first rounding each decimal to the nearest whole number, then adding or subtracting. For example, to estimate the sum of 4.94 and 2.185, round 4.94 up to 5, and round 2.185 down to 2, to get 5 + 2, which equals 7.

Thousands of Online Math Lessons

Middle School
High School Math

Pre-Algebra
Algebra 1
Geometry
Algebra 2

Community College
College Math

College Pre-Algebra
Introductory Algebra
Intermediate Algebra
College Algebra

Find the Lesson You Need

Textbook Search

Our lessons matched
to your textbook

Keyword Search

Search our lessons
by keyword:

Standardized
Test Prep

SAT
ACT
GED
ACCUPLACER
COMPASS
CLEP
GRE
GMAT
ASVAB
PRAXIS
TEAS

more tests...

Placement Test Prep

I have two boys in high school and yourteachermath has been unbelievably helpful. I have subscribed for another year and can't imagine not having their expertise when we need it!!!