Lesson: Wild Technology

Play the video “What Are Endangered Animals?” Then before or after reading the article, discuss the following questions:

• What types of technology could be used to view animals safely from a distance?
• What are some of the costs associated with saving endangered species?

• Display or write the number 436. How many hundreds are in this number? (4) Tens? (3) Ones? (6)
  
• How would you write 436 in expanded form? 400 + 30 + 6
• Have students use or draw place value blocks to represent the number.
• Add 5 ones to your blocks. What do you notice? (Students should recognize that there are 11 ones and that they can trade in 10 ones for 1 ten.)
• What number do you have now? (441)
• Then play the math video “Addition With Regrouping.”

• We can add numbers in different ways. One strategy for adding numbers is to decompose, or break them apart, into unit form.
  
• What happened to the 11 tens in the example? (It was regrouped by trading in 10 tens for 1 hundred. Then the 1 hundred was added to the 6 hundreds and the 1 ten remained.)
• How might the unit form method help you avoid making a mistake while adding? (Answers will vary.)

Have students complete problems 1 through 4 on pages 7-9 of the article.

Skills Sheets: Level Down: Adding With Base Ten Blocks (3.NBT.A.2) | On Level: DynaDash: Addition With Regrouping (4.NBT.B.4) | Level Up: Adding Large Numbers (4.NBT.B.4)

Math Video: Addition With Regrouping

Game: Jewel Addition

DynaMath@Home: Have students gather at least 10 objects each to represent the different place values. For example: hundreds (sheets of paper), tens (crayons), and ones (cereal pieces). Have them create different 2- or 3-digit numbers with their objects and add an amount to find the total. Students should write and solve the equation that matches the numbers they created with their objects.