Understanding Subtraction with Base 10

This video tutorial covers Eureka Grade 2, Module 1, Lesson 7, focusing on subtraction within 20. It explains how to represent ten using a five group column and place value stick. The lesson demonstrates subtraction strategies using visual aids and decomposing numbers, emphasizing the base-10 system. Students learn to subtract from ten and numbers greater than ten, using number bonds and mental math techniques.

What is one way to represent the number 10?

• Using a nine-group column

• Using a five-group column

• Using a six-group column

• Using a seven-group column

How many cubes are left when you subtract 9 from 10 using the five-group column?

• Three cubes

• Two cubes

• Four cubes

• One cube

When subtracting 9 from 11, how many cubes are left after using the five-group column method?

• Two cubes

• Three cubes

• Four cubes

• One cube

What is the result of 12 subtract 9 using the five-group column method?

• Four

• Three

• Two

• One

How do you decompose the number 12 for subtraction?

• Into 10 and 2

• Into 10 and 1

• Into 10 and 4

• Into 10 and 3

What does the '1' in the number 12 represent?

• Ten

• Eleven

• One

• Twelve

What is the result of 12 subtract 8 using the base 10 system?

• Three

• Four

• Two

• Five

How many ones are in the number 13 when decomposed?

• Four

• One

• Two

• Three

What is the result of 13 subtract 6 using the base 10 system?

• Eight

• Five

• Six

• Seven

Why is the base 10 system helpful in solving subtraction problems?

• It complicates subtraction

• It allows easy decomposition into tens and ones

• It simplifies addition

• It uses a base 5 system