### TOPIC 5: APPROXIMATIONS | MATHEMATICS FORM 1

Measurements

can be rounded to a certain number of significant

figures.Approximation- is a process of rounding numbers to a certain

degree of accuracy.A number can be rounded to a certain required place

value such as to the nearest ten, hundred, and thousand

The Knowledge of Rounding Off of Numbers in Computations Involving Large Numbers and Small Numbers

Use the knowledge of rounding off of numbers in computations involving large numbers and small numbers

Approximation

can be used in operation to check whether a calculation is correct or

not, i.e in addition, subtraction, multiplication and divisione.g 446 x

45 = 20 070

can be used in operation to check whether a calculation is correct or

not, i.e in addition, subtraction, multiplication and divisione.g 446 x

45 = 20 070

The

above calculation can be checked quickly whether it is correct or not

by rounding each number to 1 significant figure and then multiply i.e

400 x 50 = 20 000

above calculation can be checked quickly whether it is correct or not

by rounding each number to 1 significant figure and then multiply i.e

400 x 50 = 20 000

Therefore,

the approximation of 20 000 is close to 20 0070 is correct.Before

carrying an operation, each number in a calculation is rounded to 1

significant figure

the approximation of 20 000 is close to 20 0070 is correct.Before

carrying an operation, each number in a calculation is rounded to 1

significant figure

Example 5

Find the approximate value of

Example 6

A

school trip of 32 people went to a tour, which costs a transport fee of

580/- each people. What was the approximate total transport cost?

school trip of 32 people went to a tour, which costs a transport fee of

580/- each people. What was the approximate total transport cost?

**Solution**

32 × 580 ≈30×600 = 18 000

**The approximate transport cost was 18 000/-**