FORM ONE MATHEMATICS STUDY NOTES TOPIC 1-3.

TOPIC 1: NUMBERS
we know that when we count we start 1,2 .... . But there are other numbers like 0, negative numbers and decimals. All these types of numbers are categorized in different groups like counting numbers, integers,real numbers, whole numbers and rational and irrational numbers according to their properties. all this have been covered in this chapter
Numbers are represented by symbols called numerals. For example, numeral for the number ten is 10. Numeral for the number hundred is 110 and so on.
The symbols which represent numbers are called digits. For example the number 521 has three (3) digits which are 5, 2 and 1. There are only tendigits which are used to represent any number. These digits are 0, 1, 2, 3, 4, 5, 6, 7, 8, and 9.
The Place Value in each Digit in Base Ten Numeration
Identify the place value in each digit in base ten numeration
When we write a number, for example 521, each digit has a different value called place value. The 1 on the right means 1 ones which can be written as 1 × 1, the next number which is 2 means 2 tens which can be written as 2 × 10 and the last number which is 5 means 5 hundreds which can be written as 5 × 100. Therefore the number 521 was found by adding the numbers 5 × 100 + 2 × 10 + 1× 1 = 521.
Note that when writing numbers in words, if there is zero between numbers we use word ‘and’
Example 1
Write the following numbers in words:
  1. 7 008
  2. 99 827 213
  3. 59 000
Solution
  1. 7 008 = Seven thousand and eight.
  2. 99 827 213 = Ninety nine millions eight hundred twenty seven thousand two hundred thirteen.
  3. 59 000 = Fifty nine thousand.
Example 2
Write the numbers bellow in expanded form.
  1. 732.
  2. 1 205.
Solution
  1. 732 = 7 x 100 + 3 x 10 + 2 x 1
  2. 1 205 = 1 x 1000 + 2 x 100 + 0 x 10 + 5 x 1
Example 3
Write in numerals for each of the following:
  1. 9 x 100 + 8 x 10 + 0 x 1
  2. Nine hundred fifty five thousand and five.
Solution
  1. 9 x 100 + 8 x 10 + 0 x 1 = 980
  2. Nine hundred fifty five thousand and five = 955 005.
Example 4
For each of the following numbers write the place value of the digit in brackets.
  1. 89 705 361 (8)
  2. 57 341 (7)
Solution
  1. 8 is in the place value of ten millions.
  2. 7 is in the place value of thousands.
Numbers in Base Ten Numeration
Read numbers in base ten numeration
Base Ten Numeration is a system of writing numbers using ten symbols i.e. 0, 1, 2, 3, 4, 5, 6, 7, 8 and 9. Base Ten Numeration is also called decimal system of Numeration.
Numbers in Base Ten Numeration up to One Billion
Write numbers in base ten numeration up to one billion
Consider the table below showing place values of numbers up to one Billion.
BillionsHundred millionsTen millionsMillionsHundred ThousandsTen ThousandsThousandsHundredsTensOnes









1








10







100






1000





10000




100000



1000000


10000000

100000000
1000000000
If you are given numerals for a number having more than three digits, you have to write it by grouping the digits into groups of three digits from right. For example 7892939 is written as 7 892 939.
When we are writing numbers in words we consider their place values. For example; if we are told to write 725 in words, we first need to know the place value of each digit. Starting from right side 5 is in the place value of ones, 2 is in the place value of tens and seven is in the place value of hundreds. Therefore our numeral will be read as seven hundred twenty five.
Numbers in Daily Life
Apply numbers in daily life
Numbers play an important role in our lives. Almost all the things we do involve numbers and Mathematics. Whether we like it or not, our life revolves in numbers since the day we were born. There are numerous numbers directly or indirectly connected to our lives.
The following are some uses of numbers in our daily life:
  1. Calling a member of a family or a friend using mobile phone.
  2. Calculating your daily budget for your food, transportation, and other expenses.
  3. Cooking, or anything that involves the idea of proportion and percentage.
  4. Weighing fruits, vegetables, meat, chicken, and others in market.
  5. Using elevators to go places or floors in the building.
  6. Looking at the price of discounted items in a shopping mall.
  7. Looking for the number of people who liked your post on Facebook.
  8. Switching the channels of your favorite TV shows.
  9. Telling time you spent on work or school.
  10. Computing the interest you gained on your business.
Integers
Identify integers
Consider a number line below
The numbers from 0 to the right are called positive numbers and the numbers from 0 to the left with minus (-) sign are called negative numbers. Therefore all numbers with positive (+) or negative (-) sign are called integers and they are denoted by Ζ. Numbers with positive sign are written without showing the positive sign. For example +1, +2, +3, … they are written simply as 1, 2, 3, … . But negative numbers must carry negative sign (-). Therefore integers are all positive and negative numbers including zero (0). Zero is neither positive nor negative number. It is neutral.
The numbers from zero to the right increases their values as the increase. While the numbers from zero to the left decrease their values as they increase. Consider a number line below.
If you take the numbers 2 and 3, 3 is to the right of 2, so 3 is greater than 2. We use the symbol ‘>’ to show that the number is greater than i. e. 3 >2(three is greater than two). And since 2 is to the left of 3, we say that 2 is smaller than 3 i.e. 2<3. The symbol ‘<’ is use to show that the number is less than.
Consider numbers to the left of 0. For example if you take -5 and -3. -5 is to the left of -3, therefore -5 is smaller than -3. -3 is to the right of -5, therefore -3 is greater than -5.
Generally, the number which is to the right of the other number is greater than the number which is to the left of it.
If two numbers are not equal to each to each other, we use the symbol ‘≠’ to show that the two numbers are not equal. The not equal to ‘≠’ is the opposite of is equal to ‘=’.
Example 21
Represent the following integers Ζ on a number line
  1. 0 is greater than Ζ and Ζ is greater than -4
  2. -2 is less than Ζ and Ζ is less than or equal to 1.
Solution
a. 0 is greater than Ζ means the integers to the left of zero and Ζ is greater than -4 means integers to the left of -4. These numbers are -1, -2 and -3. Consider number line below
b. -2 is less than Ζ means integers to the right of -2 and Ζ is less than or equal to 1 means integers to the left of 1 including 1. These integers are -1, 0 and 1. Consider the number line below
Example 22
Put the signs ‘is greater than’ (>), ‘is less than’ (<), ‘is equal to’ (=) to make a true statement.
Addition of Integers
Add integers
Example 23
2 + 3
Show a picture of 2 and 3 on a number line.
When drawing integers on a number line, the arrows for the positive numbers goes to the right while the arrows for the negative numbers goes to the left. Consider an illustration bellow.
The distance from 0 to 3 is the same as the distance from 0 to -3, only the directions of their arrows differ. The arrow for positive 3 goes to the right while the arrow for the negative 3 goes to the left.
Example 24
-3 + 6
Solution
Subtraction of Integers
Subtract integers
Since subtraction is the opposite of addition, if for example you are given 5-4 is the same as 5 + (-4). So if we have to subtract 4 from 5 we can use a number line in the same way as we did in addition. Therefore 5-4 on a number line will be:
Take five steps from 0 to the right and then four steps to the left from 5. The result is 1.
Multiplication of Integers
Multiply integers
Example 25
2×6 is the same as add 2 six times i.e. 2×6 = 2 + 2 + 2 + 2 + 2 +2 = 12. On a number line will be:
Multiplication of a negative integer by a negative integer cannot be shown on a number line but the product of these two negative integers is a positive integer.
From the above examples we note that multiplication of two positive integers is a positive integer. And multiplication of a positive integer by a negative integer is a negative integer. In summary:
  • (+)×,(+) = (+)
  • (-)×,(-) = (+)
  • (+)×,(-) = (-)
  • (-)×,(+) = (-)
Division of Integers
Divide integers
Example 26
6÷3 is the same as saying that, which number when you multiply it by 3 you will get 6, that number is 2, so, 6÷3 = 2.
Therefore division is the opposite of multiplication. From our example 2×3 = 6 and 6÷3 = 2. Thus multiplication and division are opposite to each other.
Dividing two integers which are both positive the quotient (answer) is a positive integer. If they are both negative also the quotient is positive. If one of the integer is positive and the other is negative then the quotient is negative. In summary:
  • (+)÷(+) = (+)
  • (-)÷(-) = (+)
  • (+)÷(-) = (-)
  • (-)÷(+) = (-)
Mixed Operations on Integers
Perform mixed operations on integers
You may be given more than one operation on the same problem. Do multiplication and division first and then the rest of the signs. If there are brackets, we first open the brackets and then we do division followed by multiplication, addition and lastly subtraction. In short we call it BODMAS. The same as the one we did on operations on whole numbers.
Example 27
9÷3 + 3×2 -1 =
Solution
9÷3 + 3×2 -1
=3 + 6 -1 (first divide and multiply)
=8 (add and then subtract)
Example 28
(12÷4 -2) + 4 – 7=
Solution
(12÷4 -2) + 4 – 7
=1 + 4 – 7 (do operations inside the brackets and divide first)
=5 – 7 (add)
=2
TOPIC 2: FRACTIONS
A fraction is a number which is expressed in the form of a/b where a - is the top number called numerator and b- is the bottom number called denominator.
A Fraction
Describe a fraction
A fraction is a number which is expressed in the form of a/b where a - is the top number called numerator and b- is the bottom number called denominator.
Consider the diagram below
The shaded part in the diagram above is 1 out of 8, hence mathematically it is written as 1/8
Example 1
(a) 3 out of 5 ( three-fifths) = 3/5
Example 2
(b) 7 0ut of 8 ( i.e seven-eighths) = 7/8
Example 3
  1. 5/12=(5 X 3)/(12 x 3) =15/36
  2. 3/8 =(3 x 2)/(8 X 2) = 6/16
Dividing the numerator and denominator by the same number (This method is used to simplify the fraction)
Difference between Proper, Improper Fractions and Mixed Numbers
Distinguish proper, improper fractions and mixed numbers
Proper fraction -is a fraction in which the numerator is less than denominator
Example 4
4/5, 1/2, 11/13
Improper fraction -is a fraction whose numerator is greater than the denominator
Example 5
12/7, 4/3, 65/56
Mixed fraction -is a fraction which consist of a whole number and a proper fraction
Example 6
(a) To convert mixed fractions into improper fractions, use the formula below
(b)To convert improper fractions into mixed fractions, divide the numerator by the denominator
Example 7
Convert the following mixed numbers into improper fractions
Addition of Fractions
Add fractions
Operations on fractions involves addition, subtraction, multiplication and division
  • Addition and subtraction of fractions is done by putting both fractions under the same denominator and then add or subtract
  • Multiplication of fractions is done by multiplying the numerator of the first fraction with the numerator of the second fraction, and the denominator of the first fraction with the denominator the second fraction.
  • For mixed fractions, convert them first into improper fractions and then multiply
  • Division of fractions is done by taking the first fraction and then multiply with the reciprocal of the second fraction
  • For mixed fractions, convert them first into improper fractions and then divide
Example 11
Find
Solution
Subtraction of Fractions
Subtract fractions
Example 12
Evaluate
Solution
Multiplication of Fractions
Multiply fractions
Example 13
Division of Fractions
Divide fractions
Example 14
Mixed Operations on Fractions
Perform mixed operations on fractions
Example 15
Example 16
Word Problems Involving Fractions
Solve word problems involving fractions
Example 17
  1. Musa is years old. His father is 3¾times as old as he is. How old is his father?
  2. 1¾of a material are needed to make suit. How many suits can be made from
 TOPIC 3: DECIMAL AND PERCENTAGE

The Concept of Decimals
Explain the concept of decimals
A decimal- is defined as a number which consist of two parts separated by a point.The parts are whole number part and fractional part
Example 1
Example 2
Conversion of Fractions to Terminating Decimals and Vice Versa
Convert fractions to terminating decimals and vice versa
The first place after the decimal point is called tenths.The second place after the decimal point is called hundredths e.t.c
Consider the decimal number 8.152
NOTE
  • To convert a fraction into decimal, divide the numerator by denominator
  • To convert a decimal into fraction, write the digits after the decimal point as tenths, or hundredths or thousandths depending on the number of decimal places.
Example 3
Convert the following fractions into decimals
Solution
Divide the numerator by denominator

2 comments:

  1. thanks for your notes they are great but bad thing the notes for mathematics form one 4-6 are missing

    ReplyDelete

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