Explaining Subtraction Using Place Value

This lesson teaches how to explain subtraction using place value. It emphasizes the importance of explaining math concepts to others and provides examples using blocks and drawings. The lesson covers subtraction problems like 16 - 4, 57 - 25, and 51 - 36, demonstrating how to break down numbers into tens and ones for clarity. Students learn to use words, actions, or pictures to convey their mathematical thinking effectively.

Why is it important to explain your math solutions?

• To show off your skills

• To prove correctness and learn new strategies

• To confuse others

• To avoid doing homework

What is a more effective way to explain a subtraction problem than just using words?

• Ignoring the problem

• Using actions or drawings

• Writing a long essay

• Using only numbers

In the problem 16 minus 4, what is left after subtracting?

• 14

• 12

• 16

• 10

How many white milks were left after selling 25 from 57?

• 42

• 52

• 32

• 22

What is the first step in solving the white milks problem using place value?

• Break the numbers into tens and ones

• Multiply the numbers

• Divide the numbers

• Add the numbers

What challenge arises when subtracting 36 from 51 in the chocolate milks problem?

• Too many tens

• Too many ones

• Not enough ones

• Not enough tens

What is the final number of chocolate milks left after the subtraction?

• 10

• 25

• 15

• 20