I ask for $10 worth of gasoline and its selling for $1.29 a gallon, find the number of gallons i will receive, to the nearest tenth of a gallon.

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cburr's profile pic

cburr | Middle School Teacher | (Level 2) Associate Educator

Posted on

To solve this problem, you need to divide $10.00 by $1.29. When you set up the division problem, you will have two decimal points in the divisor (1.29).

Unfortunately I can't format this to look like a division problem, so you'll just have to imagine it.

1.29 | 10.00

Before you do the division, you should move the decimal two places to the right so you will have a whole number as a divisor. When you do this, you also have to move the decimal in the dividend (10.00). You end up with this:

129 | 1000

Since 129 doesn't fit into 100, you have to see how many times it will go into 1000.

129 x 7 = 903, so . . .

You will have a 7 above the ones place in the 1000.  Then subtract 903 from 1000, and you get 97.

Add some more zeros so you can keep dividing, and don’t forget the decimal point in both the dividend and the quotient.

129 | 1000.00

You had 97 left from the first step -- bring down the zero and you have 970.  Again, 129 goes in 7 times, with 67 left this time.

At this point your answer is 7.7  Even though the quotient now goes into the tenths place, you shouldn’t stop yet. You need to find out what the next number would be. If it is 5 or higher, you would have to round 7.7 up to 7.8

129 goes 5 times into 670, so you do need to round up.  There’s no need to do another step of division. Even if the next number was 5 or higher it wouldn’t make a difference because you have to round up the 5 anyway.

So, the answer is 7.8 gallons.

givingiswinning's profile pic

givingiswinning | Student, Grade 10 | (Level 1) Valedictorian

Posted on

All you need to do is divide 10 by 1.29 

10 / 1.29 = 7.75193798

when they tell you to round the tenth place they mean the first place right after the dot:

7.8 gallons

atyourservice's profile pic

atyourservice | Student, Grade 11 | (Level 3) Valedictorian

Posted on

I ask for $10 worth of gasoline and its selling for $1.29 a gallon, find the number of gallons i will receive, to the nearest tenth of a gallon.

All you need to do is divide 10 by 1.29 to see how many times 1.29 goes into 10

10 / 1.29 = 7.75193798

when they tell you to round the tenth place they mean the first place right after the dot:

Since the number behind is a 7 and the number behind that is a 5 we round up the 7 to an 7 so we end up with:

7.8 gallons

Wiggin42's profile pic

Wiggin42 | Student, Undergraduate | (Level 2) Valedictorian

Posted on

We are going to buy $10 worth of gasoline and its selling for $1.29 a gallon. Man, I wish it were so. 

To do this we have to divide 10 by 1.29. 

When you do this the answer is 7.75.... (the trailing dots means the decimals continues). 

We are rounding to the tenth place so, 7.8

atyourservice's profile pic

atyourservice | Student, Grade 11 | (Level 3) Valedictorian

Posted on

$10 worth of gasoline and its selling for $1.29 a gallon

`10-:1.29=7.75193798` to round to the nearest tenth means you round the first number after the decimal.

If a number is more that 5 you round it up. 7 is more that 5 so the 7 turns into an 8 and you end up with 7.8

so 7.8 gallons of gas

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