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Take-off

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During take-off, the wings change their shape to generate lift. The leading-edge and trailing-edge flaps are extended to increase the area of the wings. On the other hand, the elevators […]

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Brakes

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There are two types of brakes: drum brakes and disc brakes. Both braking systems use hydraulics. <Drum brakes> When the brake pedal is pressed, it moves the piston in the […]

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Bolts

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A bolt has a thread on its shaft, and is screwed into a nut which has a threaded hole. The bolt and the nut grip objects tightly. You can tighten […]

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Size words (kanji)

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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) […]

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Number words (spelling and kanji)

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Read the number words and learn how to spell them. one two three four five six seven eight nine ten すう字じをよんで、かん字をかきましょう。 一いち 二に 三さん 四よん/し 五ご 六ろく 七なな/しち 八はち 九きゅう/く […]

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Decimals

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A decimal has a decimal point. Here is an example: 72.345 (seventy-two point three four five) The 7 is in the tens place. The 2 is in the ones place. […]

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Fractions

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A fraction represents a part of a whole. There is a cake on the table. You cut it into 4 pieces. You ate one of them. What fraction of the […]

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Solid figures

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Solid figures are three-dimensional figures. A sphere is a 3-D circle, like a baseball. A cube is a 3-D square, like a dice. It has six square faces. A rectangular […]

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Angles

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When two straight lines meet, they form an angle. Right angle: an angle of 90 degrees, as in a corner of a square Acute angle: an angle less than 90 […]

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Division

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Division is the opposite of multiplication. It is the process of finding out how many times one number goes into the other number. 12 ÷ 4 = ? (Twelve divided […]