Aim of the lesson:Be able to approximate numbers to a given number of decimal places. ROUNDING BIRKDALE HIGH SCHOOL.

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Presentation transcript:

Aim of the lesson:Be able to approximate numbers to a given number of decimal places. ROUNDING BIRKDALE HIGH SCHOOL

Round the following number to 1dp Firstly, highlight the number to the first number after the decimal point So we have 6.3 But is this the answer? Now look at the number immediately after where we stopped highlighting If this number is a 0, 1, 2, 3 or 4 we don’t have to do anything else and we have our answer.

Round the following number to 1dp = 6.3 (1dp)

What if the red number was a 5, 6, 7, 8 or 9? Lets look at an example

Round the following number to 1dp Firstly, highlight the number to the first number after the decimal point So we have 9.2 But is this the answer? Now look at the number immediately after where we stopped highlighting If this number is a 5, 6, 7, 8 or 9 we increase the last digit by one. So 9.2 becomes 9.3

Round the following number to 1dp = 9.3 (1dp)

Write the following numbers correct to 1 decimal place 1) ) ) ) ) ) ) ) ) ) ) ) What about two decimal places? And three?

Vocabulary:Decimal Places Truncate