Example: What is the area of a circle whose radius is 5 cm? Given: Radius(r) = 5 cm Area of a circle: πr2 = π x 52 = π x 25 = 25π sq cm
Grades:
7-12
Example:
LCM (least common multiple) of 3 and 6
3
6
9
Grades:
5
6
7-12
Example:
4
x 2
6
8
16
Grades:
3
Example: What is the area of a circle whose diameter is 10 cm? Given: Diameter(d) = 10cm;
So, Radius(r) = Diameter/2 = 10/2 = 5cm Area of a circle: πr2 = π x 52 = π x 25 = 25π sq cm
Grades:
7-12
Example: In the number 39, where is 9?
hundreds place
tens place
ones place
Grades:
K
Example: Counting down from 5, which number comes next? 4
Start from 5 and count down (5, 4, 3, 2, ...). The number that comes before 5 is 4.