21. Length Talk About


1. Count how many steps it takes you to walk from the classroom to the office. Write it down. When you get back to the classroom, compare your answers with your friends’ answers.


a) What do you notice? b) Who is right? c) What’s the problem? d) What do we need? e) What instrument could we use to measure the distance accurately?


Fred used a metre stick to measure the height of his friend, Frank. He measured Frank as being 1m and 57cm tall. But how many centimetres tall is he?


1m = 100cm


So 1m 57cm = 100cm + 57cm = 157cm But if there are 100cm in 1 metre, what fraction of a metre is 1cm? 1cm = 1


100m __ Now write it as a decimal. 1cm = 0.01m So Frank is 1m 57cm = 157cm = 157


___ 100m = 1.57m tall.


Strand: Measures 146


Curriculum Objectives: Select and use appropriate instruments of measurement; estimate and measure length using appropriate metric units; estimate and measure the perimeter of regular and irregular shapes.


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