Lesson 21 Make Two-Digit Numbers in Different Ways
Let’s make two-digit numbers in different ways.
Warm-up Estimation Exploration: Tens and Ones
How many do you see?
Record an estimate that is:
too low
about right
too high
Record an estimate that is:
too low
about right
too high
Activity 1 All The Ways to Make 94
How many ways can you make 94 using tens and ones?
Show your thinking using drawings, numbers, or words.
Activity 2 Mystery Bags
Bag A has 2 ones and 5 tens.
How many cubes are in Bag A?
Show your thinking using drawings, numbers, or words.Bag B has 4 tens and 25 ones.
How many cubes are in Bag B?
Show your thinking using drawings, numbers, or words.Bag C has 49 cubes.
If there are 29 ones, how many tens are in the bag?
Show your thinking using drawings, numbers, or words.Bag D has 36 cubes.
If there are only 2 tens, how many ones are in the bag?
Show your thinking using drawings, numbers, or words.If you have time… Write a mystery bag problem about tens and ones.
Switch with your partner.
Solve.
Practice Problem
Problem 1
Show 4 different ways you can make 35 using tens and ones.