# Decimals With A Tape Years 4 - 8

This investigation works best if you have a partner to talk with, so you need two of everything if possible.

### Preparation

• Two [2] measuring tapes like the one shown,
or cloth ones like those used in dressmaking.
• At least one [1] calculator. (There's one on your phone.)
• Print two copies of this Recording Sheet.
• Write the title of this challenge and today's date on a fresh page in your maths journal.

### Getting Started

• Stretch out one tape across the table between you so that it reveals about 150cm.
Put something on each end to stop it moving.
• Start the activity by using the tape to help you fill in the answers on the
Recording Sheet.
• When you finish stick the sheet in your journal.

Have fun exploring Decimals With A Tape.

### Challenge

• Open this Decimals With A Tape starter. You can read it on screen or print it.
• Your challenge is to work together to discover how to add, subtract, multiply and divide decimals.
Experiment with the tapes, talk, explain, test.
You don't have to discover everything today.
• Remember to keep good notes and diagrams in your journal.

### Just Before You Finish

• Prove you have been working like a mathematician.
• In your journal make a list of all the things you did in this activity that are also things a mathematician does.
• You worked like a mathematician with decimals so you could make rules to tell others how to work them out.
• One of you make a wall poster to explain addition or subtraction.
• The other one make a poster to explain multiplication or division.