Данная работа поможет находить объем прямоугольного параллелепипеда,совершенствовать вычислительные навыки и умения решать задачи.
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«Прямоугольный параллелепипед. Объём прямоугольного параллелепипеда.»
Математика – 4 класс
Сабақ / Урок 49 Мерзім /Дата « ___» _____________ 20_____
Тақырып / Тема: Прямоугольный параллелепипед. Объём прямоугольного параллелепипеда.
Мақсат / Цель:
Ход урока
Организационный момент.
Мы сюда пришли учиться,
Не лениться, а трудиться.
Работаем старательно,
Слушаем внимательно!
Актуализация опорных знаний, умений и навыков.
№ 1 на странице 109 – назови фигуры. Все ли названия тебе известны?
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№ 2 на странице 109
Прямоугольный параллелепипед – это объемная фигура (тело), гранями которого являются прямоугольники.
Стороны этих прямоугольников являются ребрами, а их вершины – вершинами прямоугольного параллелепипеда.
Измерения прямоугольного параллелепипеда – длина, ширина и высота.
высота h
ширина b
длина a
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Посчитай объем коробок.
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3 см 4 см
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9 см
9 см
Объем прямоугольного параллелепипеда находят так:
V = a * b * h
Куб - это прямоугольный параллелепипед, у которого все грани – квадраты.
Куб имеет 6 граней. Что можно сказать про грани куба?
Грани куба равны / не равны между собой?
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№ 3 на странице 110 – рассмотри рисунки. Какие предметы имеют форму прямоугольника, прямоугольного параллелепипеда?
Ответ: многоэтажный дом, процессор.
№ 4 на странице 110 – найди объём параллелепипедов по известным измерениям.
Длина | Ширина | Высота | Объём |
9 м | 8 м | 7 м | 504 м3 |
10 см | 5 см | 8 см | 400 см3 |
8 дм | 4 дм | 3 дм | 96 дм3 |
Работа над изученным материалом.
№ 5 на странице 111 – рассмотри рисунок.
Sдна аквариума = 45 * 20 = 900
Sбоковых сторон = 30 * 20 = 600
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30 см 20 см
45 см
Домашнее задание.
№ 6 на странице 111 – вычисли.
1 251 * (4 * 5) = 1 251 * 20 = 25 020
2 452 * (2 * 5) = 2 452 * 10 = 24 520
96 300 : (3 * 3) = 96 300 : 9 = 10 700
9 810 : (3 * 30) = 9 810 : 90 = 109
5 * 3 142 * 4 = 3 142 * (5 * 4) = 3 142 * 20 = 62 840
21 032 * 5 * 6 = 21 032 * (5 * 6) = 21 032 * 30 = 630 960
15 * 2 * 12 013 = 12 013 * (15 * 2) = 12 013 * 30 = 360 390
3021 * (2 * 5) = 3 021 * 10 = 30 210