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WHAT YOU NEED: Ruler, pen, calculator, tape measure and whiteboard.
STEP 1: Write the problem and circle the key information. Here you want to convert 140 centimetres into metres, then draw two parallel bars and label the top one with the length that you know in cm and the bottom bar with a question mark.
STEP 2 - 100 cm = 1 m: Write on the conversion rate: 100 cm = 1 metre. On the top bar, the estimate by eye where you think 100 cm would be, mark it with a vertical line and colour it in.
STEP 3: Draw a line directly below on the bottom bar and colour that part in too. 100 cm = 1 m so this represents 1 m. Can you estimate, by eye, what the whole length of the bottom bar is in metres?
The metre is 100 cm. Find out how many metres are in 140 cm, you divide by 100 cm. Write calculation: the length you want to convert, 140 cm, divided by 100 cm. Before calculating it, can you estimate what the answer will be?
STEP 4 - AMOUNT IN METRES: Use a calculator to check your estimate. Then write the answer where the question mark was on the bottom bar. Don’t forget the right units – so you can write metres or the shorter ‘m’. You've done it!
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