Subtracting by Tens on an Open Number Line

What is one advantage of using an open number line over a regular number line?

• It has numbers already marked.

• It restricts the starting point.

• It allows flexibility in starting and stopping.

• It is only for addition.

When subtracting 70 minus 20 on an open number line, where should you place the number 70?

• In the middle of the line.

• On the left side of the line.

• On the right side of the line.

• At the bottom of the line.

How many tens are there in the number 20?

• Three

• Four

• One

• Two

What is the result of 70 minus 20 using an open number line?

• 60

• 50

• 40

• 70

In the subtraction 60 minus 30, how many tens do you need to count back?

• Three

• One

• Four

• Two

What is the difference when subtracting 60 minus 30 on an open number line?

• 50

• 40

• 30

• 20

When subtracting 100 minus 40, how many hops back do you need to take?

• Three

• Two

• Four

• Five

What is the result of 100 minus 40 using an open number line?

• 80

• 70

• 60

• 50

What is a key benefit of practicing subtraction on an open number line?

• It is only useful for small numbers.

• It improves skills in counting back.

• It helps in understanding multiplication.

• It makes addition easier.

What should students do after learning about subtracting on an open number line?

• Only use it in class.

• Practice at home.

• Use it for addition only.

• Forget about it.