Mathematics (Primary Classes)

The units used for measuring weight are kilogram (kg) and gram (g). 1000 gram = 1kg 1000kg = 1 ton   EXAMPLE1 Change to kilogram 2000g to kilogram   1000g… Read More »WEIGHT

Volume of cylinder = πr2h = π x r x r x h   EXAMPLE Find the volume of a cylinder of radius 3 ½ cm and height 12cm Solution… Read More »VOLUME OF CYLINDER

A right-angled triangle has 3 – sides Example 1 Calculate the area of a triangle of height 12cm and base 13cm Solution Area of triangle = ½ x base x… Read More »AREA OF RIGHT ANGLED TRIANGLE

Profit or loss percent is expressed as a percentage of the cost price EXAMPLE 1 An article bought for $3,000 was sold for $3,300. Find the profit percent Solution Cost… Read More »PROFIT AND LOSS PERCENT

Meaning of interest: interest means the extra money that you [ay back when ypu borrow money that you receive when you invest money. EXAMPLE 1 find the simple interest on… Read More »SIMPLE INTERREST

MEANING OF PROFIT When the selling price of an article is higher or greater than the cost price, we have a profit or gain. Profit = selling price – cost… Read More »MONEY: PROFIT AND LOSS

Percentages are fractions with 100 as denominator EXAMPLE 1 Change the following fractions to percentages 2/5 =  2/5 of 100 = 2/5  ×  100 = 200  = 40% 5 EXAMPLE… Read More »SIMPLE PROBLEMS ON PERCENTAGES

Meaning of Ratio The relation between two quantities (both of the same units) obtained by dividing one quantity with another is called ratio. Ratio can be denoted by using the… Read More »RATIO AND PERCENTAGE

Example 1 A man bought a leather bag for N350.00 and sold it for N360.00 will he have more money or less money with him? Solution Selling price = N460.oo… Read More »PROFIT AND LOSS

EXAMPLE Find the cost of 3 books at N91.55 each. Solution N91. 55 ×         3 N274.65   EXERCISE 52 x 4 75 x 6 75 x 6 91 x 8… Read More »PROBLEM ON MULTIPLICATION OF MONEY

Addition of Money Example: find the sum of N4.36, N3.79 and N4.82 N   K 4    36 +  3. 7 9 +  4. 8 2    12. 9 7 EXERCISES… Read More »Money

Rounding off decimals to the nearest whole number Rules for rounding off decimals to the nearest whole number When the rounding off decimals to the nearest whole number, look at… Read More »ESTIMATION

The product of 2 and 3 is; 2 x 3 = 6 2 and 3 are factors of 6 The factors of a number are numbers that divide the number… Read More »HIGHEST COMMON FACTOR (HCF)

Example 1: Find the least common multiples of 2 and 3 The multiples of 2 are: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, and 24 The… Read More »LEAST COMMON MULTIPLES (LCM)

SQUARES AND SQUARE ROOTS OF NUMBERS (1- digit and 2 – digit numbers)   Example: 1: find 22 = 4 2 =( 2 x 2) + ( 4 x 4)… Read More »SQUARES AND SQUARE ROOTS OF NUMBERS

MULTIPLICATION OF NUMBERS BY 2-DIGIT NUMBERS Example 1 multiply 25 by 12 Method 1: column form                                                  method 2: Expanded form 2    5                                                                25 x 12 = 25 x (10… Read More »MULTIPLICATION OF NUMBERS