Respuesta :
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:
[tex]3.9\times 5.3\approx 20[/tex]
Step-by-step explanation:
To find : How an estimate helps you place the decimal point when multiplying [tex]3.9\times 5.3[/tex] ?
Solution :
Estimate the number 3.9 by rounding to ones,
As tenth place 9 >5 ones place round by 1.
So, [tex]3.9\approx 4[/tex]
Estimate the number 5.3 by rounding to ones,
As tenth place 3<5 ones place remain same.
So, [tex]5.3\approx 5[/tex]
[tex]3.9\times 5.3\approx 4\times 5[/tex]
[tex]3.9\times 5.3\approx 20[/tex]
Therefore, [tex]3.9\times 5.3\approx 20[/tex]
