# Interactive video lesson plan for: How to round the factors to estimate the answer to a multiplication problem

#### Activity overview:

In this lesson we estimate the answers to several multiplication problems, using rounding. The basic rule is to round in such a manner that makes it easy for YOU to multiply mentally. In other words, there are no "hard and fast" rules as to HOW exactly you round when estimating, because it depends on your mental math capabilities.

One good principle to keep in mind is that it is helpful to round one factor UP, the other DOWN, in order to reduce or minimize the error of estimation.

In one example, I do two estimations and take the AVERAGE of those as the final estimation. So that is one more strategy you can use.

We also solve two word problems using estimation (instead of using long division, which could end up being more cumbersome).

This is meant for 4th grade math and on up, as many math curricula never teach strategies for rounding and estimating, or how estimation can be used to solve word problems.

Check out also my math curriculum for 4th grade at

Tagged under: estimation,word problems,error estimation,rounding,multiplication,factors,4th grade,math

Clip makes it super easy to turn any public video into a formative assessment activity in your classroom.

Add multiple choice quizzes, questions and browse hundreds of approved, video lesson ideas for Clip

Make YouTube one of your teaching aids - Works perfectly with lesson micro-teaching plans

Play this activity

1. Students enter a simple code

2. You play the video

3. The students comment

4. You review and reflect

* Whiteboard required for teacher-paced activities

## Ready to see what elsecan do?

With four apps, each designed around existing classroom activities, Spiral gives you the power to do formative assessment with anything you teach.

Quickfire

Carry out a quickfire formative assessment to see what the whole class is thinking

Discuss

Create interactive presentations to spark creativity in class

Team Up

Student teams can create and share collaborative presentations from linked devices

Clip

Turn any public video into a live chat with questions and quizzes

### Spiral Reviews by Teachers and Digital Learning Coaches

@kklaster

Tried out the canvas response option on @SpiralEducation & it's so awesome! Add text or drawings AND annotate an image! #R10tech

Using @SpiralEducation in class for math review. Student approved! Thumbs up! Thanks.

@ordmiss

Absolutely amazing collaboration from year 10 today. 100% engagement and constant smiles from all #lovetsla #spiral

@strykerstennis

Students show better Interpersonal Writing skills than Speaking via @SpiralEducation Great #data #langchat folks!