75
Shares and parts (practice)
Textbook: Part 3, lesson 75, pp. 13–15
GoalNumerator and denominator of a fraction; reading and writing common fractions; patterns in rows of fractions.
New words
numerator · suratdenominator · maxrajcommon fraction · oddiy kasrpattern · qonuniyat
Explanation
In a fraction the number below the line is the denominator: how many equal parts the whole was split into. The number above the line is the numerator: how many of those parts were taken. This kind of writing is a common fraction. In Uzbek we say the denominator first (o‘n oltidan yetti); in English we say 7/16 as “seven sixteenths”. To find a pattern in a row of fractions, look at how the numerator and denominator change.
Worked examples
In the fraction 5/12 the numerator is 5 and the denominator is 12: 5 of the 12 equal parts.
In the row 1/7, 2/7, 3/7, ... the denominator stays the same and the numerator grows by 1. The next fraction is 4/7.
Class activity
“Fraction cards”: one child holds a numerator card, another a denominator card, and a third reads the fraction. Then they swap roles.
Practice
1
What is the denominator of 7/15?
15
2
Write the fraction with numerator 4 and denominator 9.
4/9
3
Find the pattern and write the next fraction: 2/9, 4/9, 6/9, ...
8/9
4
A cake was cut into 12 equal pieces and 5 pieces were eaten. What part of the cake is left?
7/12
5
How many centimetres is 1/5 of a 20 cm segment?
4