University:
Glendale Community College
Course:
MAT140 | College Mathematics
Academic year:

2019
Views:

198

Pages:

1
Author:

izbra0p

Section 1.3: Multiplication and division with signed numbers Chapter 1: Introduction to Algebra Multiplication with negative numbers • When you multiply two integers with the same signs, the result is always positive. Just multiply the absolute values and make the answer positive. 𝑃𝑜𝑠𝑖𝑡𝑖𝑣𝑒 𝑥 𝑝𝑜𝑠𝑖𝑡𝑖𝑣𝑒 = 𝑝𝑜𝑠𝑖𝑡𝑖𝑣𝑒 3 𝑥 2 = 6 𝑁𝑒𝑔𝑎𝑡𝑖𝑣𝑒 𝑥 𝑛𝑒𝑔𝑎𝑡𝑖𝑣𝑒 = 𝑝𝑜𝑠𝑖𝑡𝑖𝑣𝑒 (−3)(−2) = 6 • When you multiply two integers with different signs, the result is always negative. Just multiply the absolute values and make the answer negative. 𝑃𝑜𝑠𝑖𝑡𝑖𝑣𝑒 𝑥 𝑛𝑒𝑔𝑎𝑡𝑖𝑣𝑒 = 𝑛𝑒𝑔𝑎𝑡𝑖𝑣𝑒 (3)(−2) = −6 𝑁𝑒𝑔𝑎𝑡𝑖𝑣𝑒 𝑥 𝑝𝑜𝑠𝑖𝑡𝑖𝑣𝑒 = 𝑛𝑒𝑔𝑎𝑡𝑖𝑣𝑒 (−3)(2) = −6 Division with negative numbers • When you divide two integers with the same sign, the result is always positive. Just divide the absolute values and make the answer positive. 𝑃𝑜𝑠𝑖𝑡𝑖𝑣𝑒 ÷ 𝑝𝑜𝑠𝑖𝑡𝑖𝑣𝑒 = 𝑝𝑜𝑠𝑖𝑡𝑖𝑣𝑒 8 ÷ 4 = 2 𝑜𝑟 8 =2 4 𝑁𝑒𝑔𝑎𝑡𝑖𝑣𝑒 ÷ 𝑛𝑒𝑔𝑎𝑡𝑖𝑣𝑒 = 𝑝𝑜𝑠𝑖𝑡𝑖𝑣𝑒 (−8) ÷ (−2) = 4 𝑜𝑟 • −8 =4 −2 When you divide two integers with different signs, the result is always negative. Just divide the absolute values and make the answer negative. 8 = −2 −4 −8 𝑁𝑒𝑔𝑎𝑡𝑖𝑣𝑒 ÷ 𝑝𝑜𝑠𝑖𝑡𝑖𝑣𝑒 = 𝑛𝑒𝑔𝑎𝑡𝑖𝑣𝑒 (−8) ÷ 4 = −2 𝑜𝑟 = −2 4 𝑃𝑜𝑠𝑖𝑡𝑖𝑣𝑒 ÷ 𝑛𝑒𝑔𝑎𝑡𝑖𝑣𝑒 = 𝑛𝑒𝑔𝑎𝑡𝑖𝑣𝑒 8 ÷ (−4) = −2 𝑜𝑟