Complements of number one
for 4th grade

Decimal complements: complements of 1

Decimal complements refer to the process of finding the complement of a decimal number with respect to a target number. In this topic, complements to 1, complement means the value that, when added to the given decimal number, will result in a sum of 1.

To find the decimal complement to 1, you can follow these steps:

1. Start with the given decimal number.
2. Subtract the decimal number from 1.
3. The result will be the decimal complement to 1.

For example, let's say we want to find the decimal complement to 1 of the number 0.75.

1 - 0.75 = 0.25

So, the decimal complement to 1 of 0.75 is 0.25.

Another example: Let's find the decimal complement to 1 of the number 0.412.

This is not as easy as the first example because the subtraction is harder:

1 - 0.412

Of course you can use a calculator to do this, but as mental arithmetic, the easiest way is to think of the digits after the point as a separate value, in this case 412. Because there are 3 digits, we subtract it from 1000, so we get 1000 - 412 = 588

Putting the decimal point back in, we can say:

1 - 0.412 = 0.588

So, the decimal complement to 1 of 0.412 is 0.588