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Multiply the two numbers together as if there were no decimal places. But if there are any zeros at the end of the multiple don't get rid of them (yet).
Count the number of digits after (to the right of) the decimal points in the two numbers. Add them together. That is the number of digits after the decimal that you want in the answer.
So to calculate 1.25 * 3.4
125*34 = 4250
You have 2 digits after the decimal in 1.25 and 1 in 2.4 - a total of 3
So you need 3 digits after the decimal in the answer, which gives 4.250
You can THEN get rid of the trailing zero(s) and simplify to 4.25
What else can I help you with?
How is multiplying two decimals like multiplying a whole number and a decimal?
There is almost no difference. The only difference is placing the decimal point.
How can you use an estimate to help you place the decimal point in multiplying decimals?
0.235 * 0.6891 = 0.1619385 What's to estimate? The total decimal places in the multiplicands is the total in the answer.
What is similar about when you multiply decimals and divide decimals by a power of ten?
Both multiplication and division can be performed simply by moving the decimal point of the number: to the right if multiplying, to the left if dividing. E.g. for 10, you can move the decimal point by one place to perform the operation. Multiplication by 10: move decimal one place to the right (add zero if already a whole number). Division by 10: move decimal point one place to the left (one place in if a whole number).
How are adding subtracting decimals different from multiplying them?
They aren't. The rules are the same as those for adding/subtracting or multiplying integers. Just be careful of the decimal point's location.
When multiplying two factors that each have 1 decimal place place the decimal point in the product places to the left?
two.
What is the difference between multiplying decimals and multiplying whole numbers?
You do the multiplication in exactly the same way. The only extra thing is that when multiplying decimals, you need to place the decimal point (or decimal comma - depending on your country) in the correct position. If one number has, for example, 3 digits after the decimal point, and the other 4, you need to place the decimal point in the result (BEFORE eliminating unnecessary zeros) in such a way that there are, in this example, 7 digits (3 + 4) to the right of the decimal point.
How is multiplying two decimals like multiplying a whole number and a decimal?
There is almost no difference. The only difference is placing the decimal point.
How can you use an estimate to help you place the decimal point in multiplying decimals?
0.235 * 0.6891 = 0.1619385 What's to estimate? The total decimal places in the multiplicands is the total in the answer.
When multiplying decimals how do you determine where to place the decimal in the answer?
If the two multiplicands have X and Y digits after the decimal place then their product (before removing any trailing 0s) has (X+Y) digits after the decimal point.
How do you know where to put the decimal when multiplying decimals?
If two decimal numbers have x and y digits after the decimal point respectively, then their product has (x + y) digits after the decimal point.
What is similar about when you multiply decimals and divide decimals by a power of ten?
Both multiplication and division can be performed simply by moving the decimal point of the number: to the right if multiplying, to the left if dividing. E.g. for 10, you can move the decimal point by one place to perform the operation. Multiplication by 10: move decimal one place to the right (add zero if already a whole number). Division by 10: move decimal point one place to the left (one place in if a whole number).
Where is the thousandth place in decimals?
It is the third digit after the decimal point.
Where is the tenths place in decimals?
It is the digit to the right of the decimal point. eg. 11.26. the 2 is in the tenths place
How are adding subtracting decimals different from multiplying them?
They aren't. The rules are the same as those for adding/subtracting or multiplying integers. Just be careful of the decimal point's location.
How do you align decimals when multiplying?
You do not need to align decimal points when multipylng. You multiply the two numbers ignoring the decimal point but ensuring that any trailins 0s are present. The number of digits after the decimal point in the answer is the sum of the number of digits after the decimal points in the two multiplicands.
When multiplying two factors that each have 1 decimal place place the decimal point in the product places to the left?
two.
Can you compare multiplying integers with multiplying decimals?
Yes, you can. The method used - column multiplication - is exactly the same in both cases; you simply have the additional step of locating the decimal point.
