Help

Instructions

Use the arrows to select an item.

Select the correct operator from the drop-down list.

Buttons

Show/hide this help screen

Viewing on a netbook screen

  1. Press the F11 key to enter fullscreen mode.

  2. Press the Ctrl and - keys together to zoom out and scale the activity to fit your window.

  3. To exit fullscreen mode press the F11 key again. To exit the zoomed-out view, press the Ctrl and 0 keys together.

Minimum system requirements

This activity is best viewed in a current web browser that fully supports HTML5, with a minimum screen resolution of 1024 x 768.

© Oxford University Press 2017

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