Question

find the estimated cost of 786 and 78 up to the nearest hundred​

Answer 1

Answer:

Estimating products by rounding numbers to the nearest ten, hundred, thousand etc., we know how to estimate the sum, difference, etc., to the nearest 10, 100, 1000, etc. Now we have to estimate the products.

In order to estimate products, we round the given factors to the required place value. Estimating products help us to check the reasonableness of an answer. 

1. Estimate the products of 34 and 86. 

34 ⟶ 30 34 is rounded down to 30 

86 ⟶ 90 86 rounded up to 90

34 ⟶ 30

86 ⟶ 90

34 is rounded down to 30

86 rounded up to 90

Calculate mentally 30 × 90 = 2700 

The estimated product is 2700. 

2. Estimate the products of 331 and 267 by rounding to the nearest hundred. 

331 ⟶ 300 

267 ⟶ 300 

300 × 300 = 90000 

The estimated product is 90000. 

Consider the following examples on estimating products: