JSS1: MATHEMATICS  1ST TERM

Whole Numbers I  Week 13 Topics1 Quiz

Whole Numbers II  Week 21 Topic1 Quiz

Counting in Base Two  Week 34 Topics1 Quiz

Arithmetic Operations  Week 43 Topics1 Quiz

Lowest Common Multiple (LCM)  Week 52 Topics1 Quiz

Highest Common Factor  Week 61 Topic1 Quiz

Fraction  Week 77 Topics1 Quiz

Basic Operations with Fractions I  Week 83 Topics1 Quiz

Basic Operations with Fractions II  Week 91 Topic1 Quiz

Directed Numbers  Week 103 Topics1 Quiz

Estimation and Approximation I  Week 113 Topics1 Quiz

Estimation and Approximation II  Week 126 Topics1 Quiz
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Estimation
Estimation may be defined as a rough or sensible guess of a value or calculation.
It is useful to be able to estimate the following:
1. Lengths
2. Weight (masses)
3. And capacities of any given object.
For example:
a. The length of a pencil isÂ â‰ˆ 16cm
b. The height of a man isÂ â‰ˆÂ 1.8m
c. A bag of salt isÂ â‰ˆ 1kg
Note the symbol â‰ˆ means is â€˜approximately equal toâ€™
How to choose appropriate metric units of measurement.
The common metric units and their units:
1. Length \( \scriptsize \rightarrow\) km, m, cm, mm
2. Mass \( \scriptsize \rightarrow\) tonne, kg, g
3. Capacity\( \scriptsize \rightarrow\) l, cl, ml
4. Time \( \scriptsize \rightarrow\) hour, min, seconds
Example:
State the appropriate metric unit you would use to measure the following:
1. Length of your room.
2. Length of your fingernail.
3. Your weight.
4. The weight of a diary.
5. The amount of water in a glass cup.
6. The amount of medicine in a teaspoon.
7. The time it takes a sportsman to run 100m.
8. The time it takes to fill an empty tank.
Solution
1. m
2. mm
3. kg
4. g
5. ml
6. ml
7. s
8. minÂ
This was very helpful.