Lesson 6 Use Strategies and Algorithms to Add
Let’s consider when to use algorithms and when to use other strategies to add.
Warm-up Number Talk: Little More, Little Less
Find the value of each expression mentally.
Activity 1 Just Ones
Two methods of recording the addition of
How is the newly composed ten and hundred recorded differently in each method?
Try the second method of recording to add these numbers:
Activity 2 How Would You Add?
Use a strategy of your choice to find the value of each sum. Show your reasoning. Organize it so it can be followed by others.
What do the 1s above the 2 and 5 in 253 mean in this calculation?
Use an algorithm or another strategy to find the value of each sum.