1. Slide 1 Copyright © 2015, 2011, 2008 Pearson Education, Inc. Subtracting Whole Numbers Section1.4

2. Slide 2 Copyright © 2015, 2011, 2008 Pearson Education, Inc. Subtracting Whole Numbers If you have $8 and someone borrows $3, you have $5 left. Subtraction is finding the difference of two numbers.

3. Slide 3 Copyright © 2015, 2011, 2008 Pearson Education, Inc. Example Subtract. Check each answer by adding. a. 14 – 6 b. 20 – 8 c. 93 – 93 d. 42 – 0 = 8 because 8 + 6 = 14 = 12 because 12 + 8 = 20 = 0 because = 42 because

4. Slide 4 Copyright © 2015, 2011, 2008 Pearson Education, Inc. Subtraction Properties of 0 The difference of any number and that same number is 0. For example, 11 – 11 = 0 The difference of any number and 0 is that same number. For example, 45 – 0 = 45

5. Slide 5 Copyright © 2015, 2011, 2008 Pearson Education, Inc. Subtracting Whole Numbers To subtract whole numbers, we subtract the digits in the ones place, then the tens place, then the hundreds place, and so on. Example: 7826 – 505 Line up numbers vertically so that the place values correspond. Then subtract the digits in corresponding place values, starting with the ones place.

6. Slide 6 Copyright © 2015, 2011, 2008 Pearson Education, Inc. Subtracting by Borrowing When subtracting vertically, if a digit in the second number (subtrahend) is larger than the corresponding digit in the first number (minuend), borrowing is necessary.

7. Slide 7 Copyright © 2015, 2011, 2008 Pearson Education, Inc. Example Subtract: 900 – 174

8. Slide 8 Copyright © 2015, 2011, 2008 Pearson Education, Inc. Solving Problems by Subtracting Key Words or Phrases ExampleSymbols subtract subtract 2 from 7 difference the difference of 13 and 1 less 19 less 5 less than 3 less than 24 take away 16 take away 4 decreased by 8 decreased by 7 subtracted from 6 subtracted from 14

9. Slide 9 Copyright © 2015, 2011, 2008 Pearson Education, Inc. Example Dyllis King is reading a 503-page book. If she has just finished reading page 239, how many more pages must she read to finish the book?

10. Slide 10 Copyright © 2015, 2011, 2008 Pearson Education, Inc. Example During a sale, the price of a new suit is decreased by $47. If the original price was $92, find the sale price of the suit.