estimating & rounding
Post on 01-Jan-2016
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Natalia Sivackova
Pages 63-65 (Rounding) Page 68 (Estimation)
HW pg. 70 #1-5, 15
Definition: the process of approximating a number to a given degree of accuracy
If the digit after the one that is being rounded is less than 5…
Don’t change number Make all numbers to the right of it 0
If the digit after is more than 5… Add one to the rounded digit All numbers to the right, 0
The GNI per capita in Algeria is $2730Round to the nearest hundred dollars.
Solution: Visually With Rules
28002700
2730
Since 3 is less than 5, we keep the 7 and change all the numbers to the right to 0
Definition: an approximation that is usually used to check the reasonableness of an answer
126.8 x 48.6
100 x 50
= 5000
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