Learn about Simplification of Decimal Expressions Video

TenMarks teaches you how to simplify decimal expressions using addition and subtraction.
Read the full transcript »

Learn about Simplification of Decimal Expressions Now, let’s talk about simplification of decimals and we’ll do a problem which involves the subtraction of 1.1-0.05 and then to add to it, 3.6. So we’ve got three decimals. Before we add or subtract any of them, first we have to make sure that the number of decimal number of digits after the decimal point are equal across all of them. So in this case I’ll have to write, this one has one digit, this has got two, this has got one. So let’s write them all as two digits. 1.10-0.05+3.60. Remember, adding zeros at the end of a number after the decimal point makes no change to the number. There’s no difference. Now that we’ve got this, we can now simply add them from left to right because the order of operations for Math says that we can add or subtract in either order. So it’s easy to become just do them two at a time. So let’s do this first. 1.10-0.05. So we are subtracting these two, 10-5 is 5, 0-0 is 0, 1-0 is 1. In case of a subtraction, the larger number always retains the sign. So 1.05 is the answer to the first part. So, what we’re left with is 1.05 which is the result of the first two, add it to 3.60. Taking some space we can do that. 1.05, I can add to 3.60 and simply add. 5 and 0 is 5, 0 and 6 is 6. Decimal, 1+3 is 4. So the end result is 4.65 which is what we were looking for as the answer.

Advertisement
Advertisement
Advertisement