Estimating means to have a educated guess on something. For example, measuring a table with pencils and the result could be 10 pencils, then measure the pencil on a ruler. Then esimating it can be easier and close to the actual reasult.
To convert centimetres into millimetres you times it by 10 (x10). If you're converting centimetres into metres then you divide it by 100 (÷100). For example, measuring the table and it was 20cm long, then times it by ten to convert it into millimetres ( 20 x 10 = 200 ). The same works for dividing it into metres, it has to be divided by 100 ( 20 ÷ 100 = 0.2 ).
LI: To explore standard forms of length
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