Give an estimate for each expression in Exercises, Then
state whether you believe that the exact answer is greater than or
less than the estimate. Explain how you decided. Use a calculator
to check the accuracy of your estimate. 978 X 66
1000 * 70 = 70,000 (Greater than 64,548)
To estimate the expression 978 x 66, you can use a rounding method called compatible numbers. This involves rounding one or both of the numbers to make them easier to multiply mentally.
In this case, you can round 978 to 1000 and 66 to 70. Now, perform the multiplication mentally:
1000 x 70 = 70,000
Therefore, according to the estimate, 978 x 66 is approximately equal to 70,000.
To determine whether the exact answer is greater or less than the estimate, you can use a calculator to find the exact product of 978 x 66.
Using a calculator, you would find the exact answer to be 64,548.
Comparing the estimate of 70,000 to the exact answer of 64,548, you can see that the exact answer is less than the estimate.
In summary, the estimate of 978 x 66 is approximately 70,000, and the exact answer is less than the estimate. This was determined by rounding the numbers to compatible numbers and using a calculator to find the exact product.