Spelling A: prefix tri, quad, cent, dec

4 sided shape

• triangle

• quadrilateral

• centimeter

• quadrant

100 years

• decade

• centigrade

• centimeter

• century

3 parts to a school year

• trimester

• triple

• triplicate

• semester

one of 4 parts of a divided space

• quadriceps

• quarter

• quadrant

• decimal

3 wheeled

• bicycle

• unicycle

• quad

• tricycle

Competition with 10 athletic events

• triathlon

• marathon

• decathlon

• decibel

Insect with 100 feet

• centimeter

• millipede

• centipede

• triplet

multiply by 3

• double

• quadruple

• divide

• triple

10 years

• century

• triplet

• trilogy

• decade

Competition with three athletic events

• decathlon

• triathlon

• duathlon

• trilogy