Sakamoto Math Fees in Indonesia 2026: Cost Items, How to Calculate and Online Alternatives

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Nadia Rahmawati
Math Curriculum Team, Algonova

A fraction is a number that expresses part of a whole, written as a numerator over a denominator, for example 1/2 or 3/4. Fractions are first taught in grades 3-4 of primary school and are used through secondary school. There are three main types a child should know: common fractions, mixed fractions, and decimal fractions. This guide is for parents and primary-school children who want to understand the meaning, types, and calculation of fractions from scratch.
We meet fractions every day without noticing: half a glass of milk, a quarter of a pizza, three quarters of an hour. To a child, fractions often feel scary, yet the idea is simple: dividing a whole into equal parts.
A fraction is a way of writing part of a single whole that has been shared out equally. If one apple is split into two equal parts, each part is worth 1/2 (one half). If a slice of cake is divided into four, each piece is worth 1/4.

The word "fraction" comes from breaking or dividing. So every time you share something fairly, you are really working with fractions. One key condition: the parts must be equal in size. If a cake is cut into uneven pieces, it is not yet a fraction. This is the first misconception worth clearing up early with a child.
Every fraction has two numbers separated by a line:
Example: in the fraction 3/4, the number 3 is the numerator (we take 3 parts) and 4 is the denominator (the whole is split into 4 parts). It is read as "three quarters".
Here is an easy way to remember it: the denominator sits below and states the total. Interestingly, when the denominator grows while the numerator stays the same, each slice actually gets smaller. For example, 1/8 is smaller than 1/4, because the cake is cut into more pieces.
The bigger the denominator, the smaller each slice. Once a child sees that, fractions suddenly make sense.
Putri Anggraini, Head of Math Program, Algonova
Children meet several types of fractions from primary to secondary school. Here is a summary:
| Type of fraction | Feature | Example |
|---|---|---|
| Common fraction | Just a numerator and denominator | 2/5, 3/7 |
| Mixed fraction | A whole number plus a fraction | 2 1/2, 5 2/3 |
| Decimal fraction | Written with a decimal point | 0.5 and 0.75 |
| Percentage | A fraction out of one hundred | 50% = 50/100 |
| Equivalent fraction | Same value, different numbers | 1/2 = 2/4 = 4/8 |

Interestingly, all these types are connected. The value 1/2 equals 0.5 and also equals 50%. Once a child understands that one fraction can be written in several forms, math starts to make sense instead of feeling like rote memorization.
Equivalent fractions come up most often when simplifying answers. For example, 4/8 can be simplified to 1/2 by dividing the numerator and denominator by the same number, here the number 4.
Once the meaning and types are clear, here are the basic calculation rules a child needs to remember:
This is just the outline. For full worked problems covering addition, subtraction, multiplication, and division step by step, read our dedicated guide: How to Calculate Common and Mixed Fractions.
Children stop fearing fractions when they see them as sharing a cake, not just numbers above a line.
Dewi Lestari, Mathematics Specialist, Algonova
Fraction to decimal: divide the numerator by the denominator. 3/4 = 3 ÷ 4 = 0.75.
Decimal to fraction: write it by place value, then simplify. 0.25 = 25/100 = 1/4.
A few equivalents are worth memorising because they appear constantly:
| Fraction | Decimal | Percent |
|---|---|---|
| 1/2 | 0.5 | 50% |
| 1/4 | 0.25 | 25% |
| 3/4 | 0.75 | 75% |
| 1/5 | 0.2 | 20% |
| 1/8 | 0.125 | 12.5% |
When comparing two decimals, first match the number of digits after the point. 0.7 becomes 0.70, so it is clearly larger than 0.25. Many children wrongly answer 0.25 simply because 25 is bigger than 7.
Fractions are not just textbook problems. Children already use them every day:
When parents show fractions using real objects, children understand far faster than by memorizing numbers on a board. That is why fractions are such an important foundation: the concept comes back in percentages, ratios, algebra, and even programming as a child grows.
A few simple things you can try at home:
At Algonova, we teach math through understanding, not memorization. More than 1,000,000 children across 97 countries have learned with us, with a 4.9 out of 5 rating. If you want your child to understand fractions and other math concepts in a fun way, the first class is free to try.
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A fraction is a number that expresses a part of a whole that has been divided into equal parts. It is written with a numerator above the line and a denominator below the line, for example 1/2, which means one part out of two equal parts. Fractions are first taught in grades 3-4 of primary school and are used all the way through secondary school and beyond.
The numerator is the number above the fraction line and shows how many parts are taken. The denominator is the number below the line and shows how many equal parts the whole is divided into. In the fraction 3/4, the number 3 is the numerator and 4 is the denominator, read as three quarters.
There are several common types. Common fractions such as 2/5, mixed fractions such as 2 1/2 that combine a whole number and a fraction, decimal fractions such as 0.5 written with a decimal point, percentages which are fractions out of one hundred, and equivalent fractions, which are different fractions with the same value such as 1/2 and 2/4.
For addition and subtraction, match the denominators first, then work with the numerators. For multiplication, multiply numerator by numerator and denominator by denominator. For division, flip the second fraction and then multiply. Mixed fractions are converted into common fractions before calculating.
Start with real objects such as cutting fruit, cake, or paper into equal parts, and use everyday words like half and a quarter. Connect fractions to money and time, which are familiar to children. At Algonova, children learn fractions through understanding with experienced teachers, and the first class is free to try.