Download presentation

Presentation is loading. Please wait.

Published byFernanda Goodloe Modified over 3 years ago

1
Tree Lizards Standard: 7.EE.4a Use variables to represent quantities in a real-world or mathematical problem, and construct simple equations and inequalities to solve problems by reasoning about the quantities. Photo by Tom Brennam www.reptilezofaz.com

2
Youre a research biologist interested in conserving the tree lizard species. Photo by Tom Brennam www.reptilezofaz.com

3
Example A: 5 adults, 4 women Each lays 3 eggs How many of the offspring (babies) do you think will survive? 2/3 of the offspring will survive How many lizards will there be next year?

4
Example A Continued… 5 adults, 4 females, 3 eggs per female, 2/3 eggs survive 5 + (4 x 3) x 2/3 = 5 + 12 x 2/3 5 + 24/3 5 + 8 = 13 lizards

5
Practice Problem 1: 8 adults, 4 female, each female lays 5 eggs, ½ eggs survive Write an equation Find next years population

6
Practice Problem 1: 8 adults, 4 female, each female lays 5 eggs, ½ eggs survive 8 + (4 x 5) x ½ 8 + 20 x ½ 8 + 20/2 8 + 10 = 18 lizards

7
Think about it… Reality Check! How do you really know the number of eggs that survive in the wild? A real research biologist would catch the lizards one year and come back a year later and count them again.

8
Practice Problem 2: 4 adult lizards, 2 female, each female lays 5 eggs Next year you find 12 lizards. What fraction of the eggs survived? Write an equation with x representing the fraction of eggs that survive. The solve for x.

9
Practice Problem 2: 4 adult lizards, 2 female, each female lays 5 eggs 12 lizards are found the following year 4 + (2 5) X = 12 4 + 10X = 12 10X = 12 – 4 10X = 8 X = 8/10 or 4/5

10
Closure: What mistake did the researcher make? 3 adult lizards, 2 female, each female lays 4 eggs 10 lizards are found the following year 3 + (2 4) X = 10 3 + 8X = 10 11X = 10 X = 10/11

11
Extension: What happens if some of the adult lizards die? How would you change your equation?

Similar presentations

Presentation is loading. Please wait....

OK

Use addition to eliminate a variable

Use addition to eliminate a variable

© 2018 SlidePlayer.com Inc.

All rights reserved.

Ads by Google

Ppt on water activity testing Ppt on pin diode driver Ppt on political parties and electoral process in the united Ppt on physical layer of osi model Download ppt on 2d and 3d shapes Cartoon magazine ppt online Ppt on diversity of life on earth Ppt on networking related topics such Ppt on complex numbers class 11th sample Ppt on democracy in contemporary world class 9