Addition Strategies and Balloon Problems

In this video, second-grade students learn to add four two-digit numbers using different strategies. The lesson begins with a word problem involving Rey and Cho filling balloons. The teacher explains two strategies: breaking numbers into tens and ones, and grouping numbers to make tens. These strategies are applied to solve the balloon problem and a new problem involving Yuri's bowling scores. The video concludes with encouragement to find a strategy that works best for each student and to maintain a growth mindset.

What pages in the instruction book are being used for this lesson?

• Pages 150 and 151

• Pages 120 and 121

• Pages 140 and 141

• Pages 136 and 137

What is the main focus of today's lesson?

• Adding four two-digit numbers

• Multiplying two-digit numbers

• Adding three two-digit numbers

• Subtracting two-digit numbers

In the word problem, how many red balloons does Rey fill?

• 41

• 22

• 16

• 39

What is the first step in the first model for solving the problem?

• Subtract the numbers

• Add all numbers together

• Break numbers into tens and ones

• Multiply the numbers

In the second model, which pair of numbers is grouped to make a ten?

• 16 and 22

• 41 and 39

• 22 and 39

• 16 and 41

What is the total number of balloons filled by Rey and Cho?

• 118

• 110

• 128

• 100

How does Ella's method differ from the first model?

• She uses a calculator

• She uses subtraction

• She shows the value of each digit

• She multiplies the numbers

Why are 41 and 39 grouped together in the second model?

• They make a group of ten

• They are even numbers

• They are the largest numbers

• They are the smallest numbers

What is the total number of balloons after applying the second model?

• 128

• 118

• 110

• 100

What are Yuri's bowling scores?

• 55, 62, 68, 45

• 45, 62, 68, 55

• 40, 60, 70, 50

• 35, 52, 78, 65