Polymer clays or plasticine clays are made of synthetic plastics and require âcuringâ or low heat to harden. They stay moldable for a very long time if stored properly in a plastic or metal box (no paper or fabric that would absorb the moisture). Polymer clays are usually very smooth and have a silky feeling.
On average, 4th graders are 9-10 years old because that is the normal age for the grade. But kids could potentially be anywhere from about 8 to 11 years old, since some kids hâ¦ave to repeat a year in school and get behind, and then some kids are a year ahead or have late birthdays before the cut-off date.
4th Grade redirects here. For the South Park episode, see 4th Grade (South Park). Fourth Grade (also called Grade Four or Year five in Britain) is a term used to refer to a year of elementary education in some countries. In North America, the fourth grade is the fifth school year of elementary school. Students are usually 9â10 years old, depending on their birthday.