BILL of Purchase a.k.a “BILL”: Sometimes we go to the market to buy various items like potatoes, fruits, vegetables, clothes etc. in different quantity. The shopkeeper gives us articles and we make the payment to him of the total cost of these articles. The shopkeeper keeps a record of the articles we purchase. Whenever […]
AVERAGE We often use the term ‘average’ in places like ‘the average height of the students in my class is 132cm’, ‘In the last exam, my average marks were 92’, ‘the average attendance of class in January was 52 students out of 60’ and so on. In this chapter, we will understand the meaning […]
Percentages We often hear “Flat 40% off”, “Loan at 10% interest rate”, “Secured 90% in exams” and so on. But what does “%” mean? In this chapter we will understand percentages and learn how calculating percentages can help us in daily life. After this chapter we will be able to : express fractions as percentages and vice versa; express one […]
Roman Numerals Roman Numerals & How They Began Historians believe Roman Numerals began as a tally system. Shepherds on the hills and in the fields around Rome would cut marks into sticks to keep track of how many sheep or goats were in their care. Each animal was counted then recorded on a […]
BILL of Purchase a.k.a BILL By reading the chapter’s name the very first thing comes to our mind is the money we pay. When we go to restaurants, purchase grocery for home or buy stationary for school, we pay the bill at the end. Bills are an important element in our life. In this chapter we will […]
UNITARY METHOD Unitary method is the most basic application used in our everyday life. This is because its application is based on variations. It does not have any formula. It is about the concept and the proper use of addition and multiplication. There are two types of variations: Direct variations and indirect variations. In […]
Rounding off Numbers Rounding off a number to nearest tens When we round off the units place it is called estimating a number to nearest tens. If the number at units place is below 5, it is rounded off to 0 i.e. the lower tens. If the number at units place is greater than or […]
SIMPLE INTEREST When we see “4% interest on car loans”, “3% EMI rate”, etc. on banners or in advertisements, that 4% and 3% is called the interest. There are two branches of calculating interest: Simple Interest and Compound Interest. In this chapter, we will study only simple interest. Simple interest is as important chapter […]
More about Numbers There exist other number systems as well, apart from Hindu-Arabic (the one we use in general). One such commonly used number system is the Roman numeral system. In this chapter, we will learn to read, write and convert numbers from Hindu-Arabic to Roman numerals and vice-versa. show how the Roman numeration system is […]
Division of Large Numbers Division of two numbers can be treated as repeated subtraction. It is subtracting the smaller number from the greater number repeatedly till you reach zero or get a remainder. Examples- (a) 20 ÷ 4 = 5 20 – 4 – 4 – 4 – 4 – 4 = 0 i.e. by 5 times subtracting 4 from 20. […]