Section 4.1 Our Hindu-Arabic System & Early Positional Systems

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Section 4.1 Our Hindu-Arabic System & Early Positional Systems Objectives Evaluate an exponential expression. Write a Hindu-Arabic numeral in expanded form. Express a number’s expanded form as a Hindu-Arabic numeral. Understand and use the Babylonian numeration system. Understand and use the Mayan numeration system. 12/8/2018 Section 4.1

Exponential Notation If n is a natural number (1,2,3, and so on), is read “the nth power of b” or “b to the nth power”. The expression is called an exponential expression. Furthermore, . 12/8/2018 Section 4.1

Example Exponential Expression Evaluate the following: 108. Solution: Since the exponent is 8, then we multiply 10 times itself eight times: 108=10x10x10x10x10x10x10x10 = 100,000,000 Notice the relationship: 12/8/2018 Section 4.1

Our Hindu-Arabic Numeration System An important characteristic is that we can write the numeral for any number, large or small, using only ten symbols called digits: 0,1,2,3,4,5,6,7,8,9 Hindu-Arabic numerals can be written in expanded form, in which the value of the digit in each position is made clear. Example: We can write 663 in an expanded form such that 663 = (6 x 100) + (6 x 10) + (3 x 1) = (6 x 102) + (6 x 101) + (3 x 1) 12/8/2018 Section 4.1

Our Hindu-Arabic Numeration System Hindu Arabic numeration system is called positional-value, or place-value, system. The positional values in the system are based in the powers of ten: …,105,104,103,102,101,1 Example: Write 3407 in expanded form. Solution: 3407 = (3 x 103) + (4 x 102) + (0 x 101) + (7 x 1) or = (3 x 1000) + (4 x 100) + (0 x 10) + (7 x 1) 12/8/2018 Section 4.1

Our Hindu-Arabic Numeration System Expressing a Number’s Expanded Form as a Hindu-Arabic Numeral Example: Express the expanded form as a Hindu-Arabic numeral: (7 x 103) + (5 x 101) + (4 x 1). Solution: We start by showing all powers of ten, starting with the highest exponent given. Any power left out is expressed as 0 times that power of ten. (7 x 103) + (5 x 101) + (4 x 1) = (7 x 103) + (0 x 102) + (5 x 101) + (4 x 1) = 7054 12/8/2018 Section 4.1

The Babylonian Numeration System The place values in the Babylonian system use powers of 60. The place values are The Babylonians left a space to distinguish the various place values in a numeral from one another. 12/8/2018 Section 4.1

The Babylonian Numeration System Converting from a Babylonian Numeral to a Hindu-Arabic Numeral Example: Write as a Hindu-Arabic numeral. Solution: From left to right the place values are 602, 601, and 1. Represent the numeral in each place as a familiar Hindu-Arabic numeral. Multiply each Hindu-Arabic numeral by its respective place value. Find the sum of these products 12/8/2018 Section 4.1

The Mayan Numeration System The place values in the Mayan system are Numerals in the Mayan system are expressed vertically. The place value at the bottom of the column is 1. 12/8/2018 Section 4.1

The Mayan Numeration System Example Example: Write as a Hindu-Arabic numeral. Solution: The given Mayan numeral has four places. From top to bottom, the place values are 7200, 360, 20, and 1. Represent the numeral in each row as a familiar Hindu-Arabic numeral. Multiply each Hindu-Arabic numeral by its respective place value. Find the sum of these products. 12/8/2018 Section 4.1