Add and Subtract Lengths

Add and Subtract Lengths

Mrs. Barnwell- 2nd Grade

Read the problem.

Micah has a string of beads that is 56 centimeters long. She cuts off 8 centimeters to make it the right length for a necklace. How long is the string of beads now?

Multiple Choice

Should we add or subtract to solve this problem?

• Add

• Subtract

Model It

• You can use a number line

• Start at 56.

• Subtract to get a ten.

• Then subtract the rest.

Model It

You can use a number line.

Open Ended

Look at the number line model that you made in your math journal. Write an equation you can use to solve the problem.

Multiple Choice

How long is the string of beads now?

• 47 centimeters

• 48 Centimeters

• 49 Centimeters

• 50 Centimeters

Multiple Choice

Try another problem.

Jesse threw a ball 59 feet. Owen threw a ball 15 feet less than Jesse. How far did Owen throw the ball?

• 74 feet

• 64 feet

• 42 feet

• 44 feet

Multiple Choice

How much shorter is a string of beads that is 34 centimeters long than a string that is 56 centimeters long? Use a number line and solve in your math journal.

• 21

• 78

• 22

• 79