Lesson Notes By Weeks and Term v4 - JHS 2

Lesson Video

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Performance objectives

• Identify different measuring and marking out tools.
• Accurately measure objects and ingredients.
• Understand portion control in cooking.
• Explain how to care for your measuring tools.

Lesson summary

In Ghana, from the tailor at Kantamanto market measuring fabric, to the carpenter in Kokompe cutting wood for furniture, to the caterer preparing jollof rice for a large event, accurate measurement is the foundation of all skilled work. It is the first and most critical step in creating quality products. Inaccurate measurements lead to wasted materials, poorly fitting parts, bad-tasting food, and loss of money. This lesson will equip learners with the fundamental practical skills to take accurate measurements of various items, a skill that is essential for success in any technical or vocational field, as well as in everyday life.

Lesson notes

What is Measurement? Measurement is the process of finding the size, quantity, or amount of something using a standard unit. It gives us a numerical value that everyone can understand. For example, instead of saying a piece of wood is "long," we say it is "120 centimetres long." The Importance of Accuracy Accuracy means being correct or precise. In making products, accuracy is non-negotiable. Consistency: A baker who measures ingredients accurately can produce the same quality of bread every single day. Cost Control: A seamstress who measures fabric accurately avoids wasting expensive cloth, which saves money and increases profit. Functionality: A carpenter must measure accurately for parts of a chair to fit together. If the legs are of different lengths, the chair will be useless. Safety: In construction, the correct ratio of cement, sand, and water must be measured to ensure a building is strong and safe. Types of Measurement and Corresponding Tools

There are three main types of measurement we will focus on for making products:

a) Linear Measurement (Measuring Length, Width, Height, Distance) This is measuring in a straight line. Common Tools: Steel Rule/Metre Rule: A rigid ruler for measuring and drawing straight lines. Measuring Tape: A flexible tape for measuring long distances or curved surfaces. Try Square: Used to mark lines at a perfect 90° angle to an edge. Standard Units: Millimetre (mm), Centimetre (cm), Metre (m). 10 mm = 1 cm 100 cm = 1 m How to Measure Length Accurately: Align the Zero Mark: Place the "0" mark of the ruler or tape measure exactly at the starting edge of the object. Keep it Straight: Ensure the measuring tool lies flat and straight along the edge you are measuring. Read at Eye Level: Look directly down at the measurement mark. Looking from an angle (left or right) can cause a parallax error, making the reading seem shorter or longer than it is. Record the Value and Unit: Write down the number and the unit (e.g., 35.5 cm).

b) Measuring Mass (Commonly called "Weight") This is measuring how heavy something is. It is crucial for recipes and formulas. Common Tools: Kitchen Scale (Digital or Analogue/Spring): For measuring ingredients like flour, sugar, rice, meat. Standard Units: Gram (g), Kilogram (kg). 1000 g = 1 kg How to Measure Mass Accurately (using a digital scale): Flat Surface: Place the scale on a stable, flat surface like a table. Turn On and Tare: Turn on the scale. Place the empty bowl or container on it. The screen will show the bowl's weight. Press the "TARE" or "ZERO" button. This subtracts the bowl's weight, and the screen will return to "0 g". Add the Ingredient: Carefully and slowly add the ingredient (e.g., flour) into the bowl until the screen shows the desired weight.

Evaluation guide

• B8.3.1.1
• Demonstrate
• understanding of measuring and marking out tools and
• equipment