84 Chapter 1 Whole Numbers Section 1.3 Subtraction of Whole Numbers Key Concepts To round a number, follow these steps. Step 1 Identify the digit one position to the right of the given place value. Step 2 If the digit in step 1 is a 5 or greater, add 1 to the digit in the given place value.Then replace each digit to the right of the given place value by 0. Step 3 If the digit in step 1 is less than 5, replace it and each digit to its right by 0. Round to estimate sums and differences. 31 20 19 13 6 Examples Example 1 Round each number to the indicated place. a. 4942; hundreds place 4900 b. 3712; thousands place 4000 c. 135; tens place 140 Example 2 Round to the thousands place to estimate the sum: 3929 2528 5452. Solution The sum is approximately 12,000. 4000 3000 5000 12,000 Key Concepts The difference is the result of subtracting the subtrahend from the minuend. Subtract numbers with and without borrowing. There are several words and phrases that indicate subtraction, such as minus, difference, decreased by, less than, and subtract from. Examples Example 1 For , the minuend is 19, the subtrahend is 13, and the difference is 6. Example 2 9 1 10 14 Example 3 The difference of 15 and 7 translates to Example 4 The expression can be translated to 31 decreased by 20, or subtract 20 from 31. 15 7. 2 0 4 8 8 1 1 6 398 227 171 Section 1.4 Rounding and Estimating
miller_basic_college_math_3e_ch1_3
To see the actual publication please follow the link above