# Estimating products

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##### Examples

###### Lessons

**Estimating Products by Rounding**

Estimate the product using estimation by rounding. Then, find the exact product to check your answer.**Estimating Products by Clustering**

Estimate the product using estimation by clustering. Then, find the exact answer to check your estimate.**Estimating Products with Compatible Numbers**

Estimate the product using compatible numbers. Is the estimated product less than or greater than the exact product?**Comparing estimated products**

Compare the products by first estimating each product using compatible numbers. Then, use symbols (for less than <, greater than >, or about equal to $\approx$) to show which product will be greater.8$\frac{1}{2}$ × $\frac{4}{7}$ vs. $\frac{4}{9}$ × 10$\frac{1}{3}$ **Estimating Products Word Problem - 1**

If a box of twelve mangoes costs $47.88 and weighs 5.34 pounds:- About how much will 350 boxes of mangoes cost? Use the estimation by rounding method.
- About how much will 350 boxes of mangoes cost? Use the estimation with compatible numbers method.
- Find the exact cost of 350 boxes of mangoes? Are your estimates from part a) and b) more or less than the exact cost?
- About how many pounds will 350 boxes of mangoes weigh? Use the estimation by rounding method.
- About how many pounds will 350 boxes of mangoes weigh? Use the estimation with compatible numbers method.
- Will the boxes of mangoes weigh more than or less than 1,500 pounds? Are your estimates from part c) and d) more or less than the exact cost?

**Estimating Products Word Problem - 2**

Elsa used 4$\frac{3}{4}$ flasks full of blue liquid in her science experiment. Charlie wants to use 2$\frac{1}{5}$ times as much as Elsa. About how many flasks of blue liquid would Charlie need for his experiment?