A quadrilateral is a polygon with 4 sides. A rectangle has 4 right angles. A square has 4 right angles and 4 congruent sides. A parallelogram has 2 pairs of […]

There are three main types of rocks. Igneous rocks: These rocks form when magma (molten rock) cools and hardens. (e.g., pumice) Sedimentary rocks: These rocks form when sediment piles up […]

Cells are the smallest unit of all living things. Cell membrane: This surrounds the cell. Nucleus: This controls the activities of the cell. It contains DNA. DNA: This carries the […]

1. Egg: A female frog lays eggs in a pond. The eggs hatch into tadpoles. 2. Tadpole: The tadpole eats algae and grows bigger. Then it grows its hind legs […]

<Adding fractions> If the denominators are the same, add the numerators. The denominator remains the same. 1/5 + 2/5 = 3/5 <Subtracting fractions> If the denominators are the same, subtract […]

You can find the perimeter of a figure by adding the lengths of the sides. For example, if your carpet is 4 meters long and 3 meters wide, its perimeter […]

The area of a figure is represented by how many square units are inside the figure. If a square unit is 1 centimeter long on each side, its area is […]

Latitude shows the distance north or south from the Earth’s equator. Lines of latitude run parallel to the equator. Therefore, they are called parallels. Longitude shows the distance east or […]

Read and write the size words. (Grade 1) long short high low thick thin wide narrow 大おおきさをあらわすことばを読よんで、かん字じを書かきましょう。2年生ねんせいでは、5ついつつのかん字をならいます。 長ながい みじかい 高たかい ひくい 太ふとい 細ほそい 広ひろい せまい *みじかい → 短い (Grade 3) […]