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