How do you use rounding and compatible numbers?

What is the difference between compatible and rounding numbers?

To make the problem easier to solve, we use compatible numbers. We round up each number to the nearest ten or twenty-five, fifty, or hundred. Compatibility makes it easier to solve the problem in our heads. We can round up the numbers to the nearest hundred or ten spots.

How do you round a number? Here is the general rule of rounding:

1. Round the number up if the number you are rounding has been followed by 5, 6, 7, 8 or 9. Example: 38 is rounded up to the nearest ten.
2. Round the number down if the number you are rounding follows by 0, 1, 2, 3, 3 or 4. Example: 33 is rounded up to the nearest ten.

Also, learn more about compatible numbers examples.

• Complementary numbers are numbers that can be added, subtracted, multiplied, divided, or multiplied mentally. If you are using estimation to approximate a calculation of numbers, replace actual numbers by compatible numbers.
• Example 1 (Additional) 500 + 300 = 800
• Example 2 (Subtraction), 19.4 a.3.8 = 15.6
• Example 3 (Multiplication).

What are place values?

The place value is the location value of a digit within a number. Place values are determined based on how many places the digit lies to either the right or left of the decimal point. The tens place is the second place to the right of the decimal point, or 101.