Copyright © 2010 Pearson Education, Inc. All rights reserved Sec Chapter 1 Introduction to Algebra: Integers 1.6Multiplying Integers

Copyright © 2010 Pearson Education, Inc. All rights reserved. Sec Objective 1: Use a raised dot or parentheses to express multiplication. Numbers being multiplied are called factors and the answer is called the product.

Copyright © 2010 Pearson Education, Inc. All rights reserved. Sec Objective 1: Use a raised dot or parentheses to express multiplication. Rewrite the multiplication in three different ways. 10 × 7 Example The factors are 10 and 7 and the product is 70.

Copyright © 2010 Pearson Education, Inc. All rights reserved. Sec Objective 2: Multiply integers.

Copyright © 2010 Pearson Education, Inc. All rights reserved. Sec Objective 2: Multiply integers. Multiply the integers. – 2 8 Example

Copyright © 2010 Pearson Education, Inc. All rights reserved. Sec Objective 2: Multiply integers. Multiply the integers. – 10 ( – 6 ) Example

Copyright © 2010 Pearson Education, Inc. All rights reserved. Sec Objective 2: Multiply integers. Multiply the integers. – 3 (4 – 5) Example Multiply numbers in parentheses first. Then multiply the resulting pair of numbers.

Copyright © 2010 Pearson Education, Inc. All rights reserved. Sec Objective 3: Identify properties of multiplication.

Copyright © 2010 Pearson Education, Inc. All rights reserved. Sec Objective 3: Identify properties of multiplication.

Copyright © 2010 Pearson Education, Inc. All rights reserved. Sec Objective 3: Identify properties of multiplication. Illustrate the commutative property for the product below. – 7 – 4 Example

Copyright © 2010 Pearson Education, Inc. All rights reserved. Sec Objective 4: Estimate answers to application problems involving multiplication. Last year a video store had to replace 392 defective videos at a cost of $19 each. Estimate the amount of money the store lost on the videos. Example Front end rounding: 392 rounds to 400 and – $19 rounds to – $20.