1. Adding and Subtracting Decimals Unit 3 Lesson 4

2. 10 millimeters = 1 centimeter 10 centimeters = 1 decimeter

3. A decade is 10 years. A decagon has 10 sides. The decathlon is a combined event of ten track and field events. The decathlon is a combined event of ten track and field events. A decimal is a symbol that defines place value by 10. Deci-

4. centipede means “hundred feet”, but no centipede has that many feet. The 1800s (1800-1900) are called the 19 th Century. 100 years The 1900s (1900-2000) are called the 20 th Century. The 2000s (2000-2100) are called the 21 st Century. 100 years She is 100 years old and is a called a centenarian. Centi-

5. Millipede means “thousand footed, but no millipede has that many feet 1011 2011 A millennium is a period of 1,000 years. April 1011 to April 2011 is a millennium. Milli-