maths

• density=mass divided by volume
• surface area = 2(length x width) + 2 (length x height) + 2 (width x height)
• volume = length x width x height
• perimeter = sum of all sides
• area = base x height
• average speed = total distance / time taken to travel that distance
• speed = distance travelled per unit time
• distance = rate x time
• acceleration = change in velocity / time taken to make the change
• velocity = speed in a given direction
• time = distance / rate
• distance = average speed x time taken
• percentage increase/decrease = new value - old value / old value x 100%
• velocity = displacement / time taken to move that distance
• force = mass x acceleration
• percentage decrease = (old value - new value) / old value x 100%