Question

Estimate the product by first rounding each number to the highest place value. 2.49 X 420.2

Answer 1

Given the expression:

$2.49\text{ x }420.2$

first let's roud to the highest place value each term:

$\begin{gathered} 2.49\approx2.5\approx3 \\ 420.2\approx420\approx400 \\ \end{gathered}$

then, an estimate product is:

$3\cdot400=1200$

which is close to the original product:

$2.49\cdot420.2=1046.3$