Two decimal numbers add together to equal one. One of the numbers is 0.007. What is the other number?
So we know that 0.007 plus the missing number equals one. We could use the inverse to help calculate the answer: one subtract 0.007 equals the missing number. The seven digit represents seven thousandths.
And we can think of one whole as a thousand thousandths. So we need to subtract seven thousandths from a thousand thousandths, which leaves us with nine hundred and ninety-three thousandths, which we would write as 0.993 in decimal form.
The number which we add to 0.007 to make one is 0.993.