how to sole when the decimal number and a whole number in subpration
Answers
Step-by-step explanation:
The problem of subtraction is to name the number we must add to the smaller number so that their sum will equal the larger number. How could you know that 12 minus 9 is 3? Because you know that 9 plus 3 is 12. That is, you know elementary addition.
We will now present two methods of written subtraction. One is the familiar subtraction by regrouping, or borrowing. The other is the less familiar but simpler method of adding to both numbers. It is taught in many countries, and is based on the following property of subtraction:
If we add the same number to both the larger and the smaller, the difference will not change.
10 − 8 = 12 − 10.
We illustrated that in the previous Lesson. We will present that method first.
(For subtraction by regrouping, or borrowing, see below.)
Subtraction by adding to both numbers
Problem. The town of Huntley has a population of 8,345. The neighboring town of Jasper has a population of 5,872. How many more people live in Huntley?
Solution. What must we add to the population of Jasper to equal the population of Huntley? That is a subtraction problem.
8,345
− 5,872
First, we will state the rule for doing it; then we will analyze why.