Explain how an estimate helps you place the decimal point when multiplying 3.9 × 5.3
An estimate helps you because you round 3.9 to 4 and 5.3 to 5 so then you can give a rough estimation
Answer:
\(3.9\times 5.3\approx 20\)
Step-by-step explanation:
To find : How an estimate helps you place the decimal point when multiplying \(3.9\times 5.3\) ?
Solution :
Estimate the number 3.9 by rounding to ones,
As tenth place 9 >5 ones place round by 1.
So, \(3.9\approx 4\)
Estimate the number 5.3 by rounding to ones,
As tenth place 3<5 ones place remain same.
So, \(5.3\approx 5\)
\(3.9\times 5.3\approx 4\times 5\)
\(3.9\times 5.3\approx 20\)
Therefore, \(3.9\times 5.3\approx 20\)