Lesson 21 Compare Two-Digit Numbers Shown in Different Ways
Let’s compare numbers.
Warm-up Number Talk: Addition Within 20
Find the value of each expression mentally.
Activity 1 Elena and Kiran Compare Collections
Elena and Kiran are comparing their collections.
Elena says, “I have 5 tens 32 ones.”
Kiran says, “I have 7 tens 2 ones.”
Who has more in their collection?
Show your thinking using drawings, numbers, words, or expressions.
Activity 2 Base-Ten Representation Compare
What do you notice?
Circle the representation that shows the greater number.
Write a number to match each representation.
Then write a comparison statement using <, >, or =.
5 tens 2 ones
12 ones 3 tens
1 ten 25 ones
7 tens 29 ones
Fill in each blank with