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Why can you just move the decimal point to find a solution when you multiply or divide by but not when you multiply or divide by a number that is not a power of 10?
Wiki User
∙ 8y ago
This is because we use the decimal system which is based on the fact that the place value of any digit is ten times that of the digit to its right.
Wiki User
∙ 6y ago
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Why can you just move the decimal point to find a solution when you multiply or divide by 101001000but not when you multiply or divide by a number that is not a power of 10?
You cannot just move the decimal when you multiply or divide by 101001000.
How do you calculate 2 fifths of a number?
Multiply the number by 2 and then divide by 5 or, more simply, multiply by 4 and move the decimal point one place to the left.
How do you multiply and divide decimals by powers of ten?
move the decimal point how much zeros that is in the number multiply to the Right, divide to the Left 18.75 X 100= 1875 !8.75/100= 0.1875
How do you work out 2439.6 divided by 38?
64.2
What do you multiply a number by to move the move the decimal place to the right?
Multiply by ten to move the decimal one place to the right. Multiply by 100 to move two places to the right. Divide by ten to move it one place to the left.
Why can you just move the decimal point to find a solution when you multiply or divide by 101001000but not when you multiply or divide by a number that is not a power of 10?
You cannot just move the decimal when you multiply or divide by 101001000.
To multiply or divide a number by 10000 how many places should you move the decimal?
2
How do you get 30 percent of a number?
30 percent as a decimal is 0.3 (divide a percent by 100 to get the decimal value)Multiply the number by 0.3 to determine 30% of the number.
How do you convert a fraction to a decimal and then percentage?
To convert a fraction to a decimal divide the numerator (top number) by the denominator (bottom number). To convert a decimal (or fraction) to a percentage multiply it by 100 %.
Why Move the decimal point to the right when you multiply?
The reason is because you have to make the number bigger when you multiply. When you move the decimal to the right you make the number bigger, when you move it to the left you make it smaller. Therefore, when you divide you must move the decimal to the left.
How do you calculate 2 fifths of a number?
Multiply the number by 2 and then divide by 5 or, more simply, multiply by 4 and move the decimal point one place to the left.
Multiply by 100 percent?
If you multiply a number by 100%, you are simply multiplying by 1. You can multiply by 100% to change a decimal number or fraction to a percent. (0.25)(100%)=25%. You can also divide by 100% to change a percent to a decimal number. 65%/100%= 65/100 or 0.65.
What is 0.379 as a fraction?
Multiply the number such that there are no decimal points, just a whole number. Thus if you multiply by 1000, you get 379. Since you multiplied you must divide by the same number to preserve the value. So divide 370 by 1000 and the answer is 379/1000
How do you multiply and divide decimals by powers of ten?
move the decimal point how much zeros that is in the number multiply to the Right, divide to the Left 18.75 X 100= 1875 !8.75/100= 0.1875
How do you find 40 percent of a number?
To find 40% of a number, either multiply by .4 or multiply by 2 and divide by 5 or else multiply by 4 and move the decimal point one place to the left.
How do you work out 2439.6 divided by 38?
64.2
What do you multiply a number by to move the move the decimal place to the right?
Multiply by ten to move the decimal one place to the right. Multiply by 100 to move two places to the right. Divide by ten to move it one place to the left.
