How to change a fraction into a percentage

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A one-minute video showing you how to change a proper fraction into a percentage.

Change a fraction into a percentage slideshow

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WHAT YOU NEED: A whiteboard, ruler, pen and calculator.
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STEP 1 - DRAW TWO BARS: Write out the problem and circle the key pieces of information. Here it is the fraction, 13/20, and what you want to turn it into, a percentage...
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...draw a bar and label the top of the bar with the bigger number in the fraction. Here it is 20. Estimate by eye where the smaller number in the fraction - here it is 13 - would sit on the bar. Draw a vertical line to mark it and colour it in.
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STEP 2 - FRACTION ON TOP BAR: Add a parallel bar below the top one. Mark 100% at one end. Then draw a vertical line below the one on the top bar and colour it in. This is the percentage you want to find. Mark it with a question mark...
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...now rub out the 100% and replace it with 1, so the question mark now represents a decimal between 0 and 1.
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STEP 3 - DIVIDE FOR DECIMAL: Write out the fraction as a division. You need to divide the top number in the fraction by the bottom number in the fraction. Here it is 13 divided by 20. Before you use a calculator, can you estimate what the answer will be?
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...use a calculator to check your answer. Then multiply that number by 100 to get the percentage.
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Step 4 - MULTIPLY BY 100 for %: So you need to find 0.65 x 100 = 65%. On the bottom bar, change the 1 back to 100%, and change the question mark to 65%.
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Now you know that 13/20 is equivalent to 65%, think about what this means in context. For instance what mark do you think you would need to get 70%?