JSS1 Second Term Mathematics Lesson Note – Estimation

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WEEK 1

ESTIMATION

CONTENTS

• Estimation of dimensions and distances.
• Estimation of capacity and mass of objects
• Estimation of other things e.g time, age, squares and square root
• Quantitative reasoning involving estimation

Estimation of dimensions and distances

Estimation is making a guess of the nearly correct calculations and distances, weights, prices or capacity of things without the actual measurements or calculations. Estimations help us to have rough idea of the answer when we add, subtract, multiply or divide any given quantity. Sometimes rounding off and approximations are used in making an estimation.

Examples of estimations are as follows:

• The mass of my friend is 200km
• The distance of this school from my house is 3 kilometers
• The weight of our teacher’s table is 500 grammes

When physical quantities are measured, they need to be expressed in standard units of measurement. A unit is therefore a standard used in the measurement of a physical quantity. These physical quantities are length, mass, time, capacity and even currency.

Distances: this is a linear measure of length. The metric system uses multiples of ten to build up its table measurement. The basic unit of length is Metre.

10 millimeter (mm) = 1 centimetre

10 centimeters (cm) = 1 decimetre

10 decimeters (dm) = 1 metre

10 meters (m) = 1 decametre

10 decameters (dam) = 1 hectometre

10 hectometers (hm) = 1 kilometre

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