Unit 1, Lesson 7-- Mental Math
Lesson 7-- Mental math
Introduction
Welcome back Mathematicians! Today, we will practice "mental math." Mental math is a way of doing math only in your head, without using tools like counters or drawings.
Video
Take a look at the arrangement of dots in this video. Then answer the following questions in your math notebook:
- How many dots do you see?
- How do you know?
- Do you see it more than one way?
Now, watch this solutions video. Did you see any of these groupings?
Interactive
Directions:
- Click the link below to watch the slideshow. It will play automatically.
- Some images are dot arrangements, some are photographs.
- Get ready to quickly make mental groups to determine the total amount.
- For a challenge, watch the show again and see if you can make different groups.
Mental Math Slides Deck Links to an external site.
[CC BY 4.0] UNLESS OTHERWISE NOTED | IMAGES: LICENSED AND USED ACCORDING TO TERMS OF SUBSCRIPTION
From Georgia Department of Education, Math