Calculating magnification

The actual size of a woodlouse is 0.4 mm but suzy drew it 5 mm long. What is the magnification?

Mathematical Equivalence

ON

What are the units of magnification?

• divide

• multiply

• add

• times

A plant cell in a photograph measures 15 mm across. If the actual size of the cell is 0.015 mm, what is the magnification in the photograph?

Mathematical Equivalence

ON

The nucleus in a photograph of a cell measures 3mm across. If the magnification in the photograph is x500, what is the actual size of the nucleus in micrometers?

Mathematical Equivalence

OFF

You are looking at onion cells under the microscope and want to know how big the cells really are. You measure the size of the cells and they measure 20mm with a magnification of 1000x. Work out the actual size of the cell, in micrometers.

Mathematical Equivalence

ON

What is the actual size of a bacterial cell, if the image size is 33 mm and it's been magnified x5500, in micrometers?

Mathematical Equivalence

ON