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# Small Decimal Rounding to a Leading Digit

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Practice Small Decimal Rounding to a Leading Digit
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Estimate Decimal Products and Quotients Using Leading Digits

Have you ever had to figure out a dilemma involving money? Take a look at this situation.

### Vocabulary

Dividend
the number being divided in a division problem. It is often the first number in a problem written horizontally.
Divisor
the number doing the dividing in a division problem.
Estimate
an approximate answer that is reasonable and makes sense for the problem.
the first digits in a decimal-often the whole number part of the decimal.

### Guided Practice

Here is one for you to try on your own.

Estimate using leading digits.

$120.0045 \div 6.237$

Solution

First, we take only the leading digits and rewrite this problem.

$120 \div 6$

Now our work is quite simple.

$120 \div 6 = 2$

Our estimate is $2$ .

### Practice

Directions : Estimate each product or quotient by using leading digits.

1. $35.0012 \div 5.678$

2. $5.123 \times 11.0023$

3. $12.0034 \div 4.0012$

4. $12.123 \times 3.0045$

5. $48.0012 \div 12.098$

6. $13.012 \times 3.456$

7. $33.234 \div 11.125$

8. $12.098 \times 2.987$

9. $4.769 \times 8.997$

10. $14.98 \div 7.002$

11. $24.56087 \div 8.0012$

12. $45.098 \div 5.0098$

13. $9.0987 \times 9.0001$

14. $34.021 \times 4.012$

15. $21.0098 \times 2.0987$

16. $14.231 \times 3.7601$

17. $144.0056 \div 12.0112$