Question
$1.38 x 5.5=
- $75.90
- $7.59
- $0.75
- $0.76
Hint:
In decimal multiplication, first we have to add the number of digits after the decimal point in both the numbers for example, in the given question two numbers whose product is asked is $1.38 and 5.5 so the sum of the digits after the decimal point in both the numbers is 3 ( two in 1.38, i.e., 38 and one in 5.5 ,i.e., 5). Then we perform normal multiplication of 1.38 and 5.5 (ignoring the decimal point) and in the product that we get we need to put the decimal point after 3 digits( i.e., the sum of digits that we found at first) from right. And we will get our required answer which is $7.59
The correct answer is: $7.59
Step by step solution:
Given two decimal numbers whose product is to be found: 1.38 and 5.5
Now, we need to multiply the two decimal numbers
$ 1.38
x 5.5
7590 (we got the product by ignoring the decimal point)
Now, we have to place the decimal point after 3 digits from the right, i.e., $ 7.590 or $7.59 (since zeroes at the end to the right of the decimal point can be ignored) which is the required product of the two numbers.
Thus, option (b) is the correct option.
Related Questions to study
6.97 x 2.3 =
6.97 x 2.3 =
5.7 x 0.9
5.7 x 0.9
Steve Rogers drinks 4.5 gallons of milk per day. Each bottle contains 16.5 fluid ounces. The fluid ounces of milk does he drink per day is
Another approach to the question could be that we add the amount of milk each bottle contains (fluid ounces) 4.5 times, i.e., the number of gallons of milk Steve drinks.
Thus fluid ounces of milk Steve drinks per day = 16.5 + 16.5 +16.5 +16.5 + (16.5/2) [here we divide the last 16.5 by 2 since it is given 4.5 ] = 74.25 fluid ounces .
Thus, option (b) is the correct option.
Steve Rogers drinks 4.5 gallons of milk per day. Each bottle contains 16.5 fluid ounces. The fluid ounces of milk does he drink per day is
Another approach to the question could be that we add the amount of milk each bottle contains (fluid ounces) 4.5 times, i.e., the number of gallons of milk Steve drinks.
Thus fluid ounces of milk Steve drinks per day = 16.5 + 16.5 +16.5 +16.5 + (16.5/2) [here we divide the last 16.5 by 2 since it is given 4.5 ] = 74.25 fluid ounces .
Thus, option (b) is the correct option.
A bag of grass seed weighs 5.8 pounds. Calculate the pounds 2.5 bags would weigh.
Another approach to the question could be that we could add 5.8 pounds, i.e., the weight of one bag 2.5 (number of bags to be weighed) times.
Thus, the weight of 2.5 bags = 5.8 + 5.8 + (5.8÷2) pounds
= 14.5 pounds
Hence, option (c) is the correct option.
A bag of grass seed weighs 5.8 pounds. Calculate the pounds 2.5 bags would weigh.
Another approach to the question could be that we could add 5.8 pounds, i.e., the weight of one bag 2.5 (number of bags to be weighed) times.
Thus, the weight of 2.5 bags = 5.8 + 5.8 + (5.8÷2) pounds
= 14.5 pounds
Hence, option (c) is the correct option.
