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1 vote
Explain how an estimate helps you place the decimal point when multiplying 3.9 × 5.3

2 Answers

1 vote
An estimate helps you because you round 3.9 to 4 and 5.3 to 5 so then you can give a rough estimation
User Mister
by
7.9k points
2 votes

Answer:


3.9* 5.3\approx 20

Explanation:

To find : How an estimate helps you place the decimal point when multiplying
3.9* 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* 5.3\approx 4* 5


3.9* 5.3\approx 20

Therefore,
3.9* 5.3\approx 20

User Mr Beardsley
by
8.1k points

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