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JSS1: MATHEMATICS - 1ST TERM

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  1. Whole Numbers I | Week 1
    3 Topics
    |
    1 Quiz
  2. Whole Numbers II | Week 2
    1 Topic
    |
    1 Quiz
  3. Counting in Base Two | Week 3
    4 Topics
    |
    1 Quiz
  4. Arithmetic Operations | Week 4
    3 Topics
    |
    1 Quiz
  5. Lowest Common Multiple (LCM) | Week 5
    2 Topics
    |
    1 Quiz
  6. Highest Common Factor | Week 6
    1 Topic
    |
    1 Quiz
  7. Fraction | Week 7
    7 Topics
    |
    1 Quiz
  8. Basic Operations with Fractions I | Week 8
    3 Topics
    |
    1 Quiz
  9. Basic Operations with Fractions II | Week 9
    1 Topic
    |
    1 Quiz
  10. Directed Numbers | Week 10
    3 Topics
    |
    1 Quiz
  11. Estimation and Approximation I | Week 11
    3 Topics
    |
    1 Quiz
  12. Estimation and Approximation II | Week 12
    6 Topics
    |
    1 Quiz



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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 is  ≈ 16cm
b. The height of a man is  ≈  1.8m
c. A bag of salt is  ≈ 1kg

Note the symbol     means is ‘approximately equal to’

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. min 

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