ICSE Class 5 Maths, Unit 1: Numbers

What this unit aims at

Children will be enabled to understand how the place value system works thereby helping them to think about the size of large numbers that they have not counted. Estimation is an essential skill that demonstrates number sense about base 10 system. Activities based on items such as beans or marbles help children develop strategies for estimating quantities. Numerals are written in both compact form and expanded form is used in algorithms. Rounding is a skill to estimation that requires understanding of a relationship between numbers. Opportunities will be provided to facilitate children’s use of the place value frame and place value chart to represent large numbers. They will learn to express numbers in many ways like with words (number names), numerals and words, numerals only and finally develop scientific or exponential notations for large numbers in higher classes.

Your child should be able to

• read and write large numbers up to crores using the Indian numeration system
• compare the Indian numeration system with the International system and read, write numbers using International numeration system
• use place value to write a number in expanded form and vice versa
• compare large numbers using place value
• use place value to form greatest and smallest numbers from the given digits
• round off numbers to nearest 10s, 100s or 1000th
• represent numbers using roman symbols
• acquire understanding about fractions
• find the fractional part of a collection
• identify and form equivalent fractions of a given fraction; 1 1 1 express a given fraction , , in decimal notation and vice-versa. For example, in using 2 4 5 units of length and money - ` 5 is half of ` 10

Key concepts in this unit

• Indian and International system of numbers- 9 digits numbers.
• Place value and face value.
• Expanded form.
• Comparison of the numbers.
• Ascending and descending order of numbers.
• Formation of greatest and smallest numbers from the given digits.
• Rounding off numbers- nearest 10, 100, 1000.
• Construction of Multiplication Tables - 2 to 20.
• Addition, Subtraction, Multiplication, Division by 2-digit division.
• Word problems.
• Roman numerals for large numbers.