Scale Whole Numbers on a Double-Sided Number Line: Part II 5-85
Lay the foundation for ratio and slope by applying the unit rate. If it rains 21 inches in 7 months, how much will it rain in 36 months? 36 is not a multiple of 7, but 21 is. Since 21 inches in 7 months is a rate of 3 inches in 1 month, it will rain 36 x 3 inches = 108 inches in 36 months. Use the unit rate to scale quantities proportionally.
