Page 8 - Genius PBD - Mathematics Year 4

UNIT 1 Numbers and Operations Theme: Numbers and Operations

Genius Notes Write 21 068 in words.

1. Place value and digit value of a number.
Example: 53 917

Digit 5 3 9 1 7
Place value ten thousands thousands hundreds tens ones
Digit value 50 000 3 000 900 10 7

2. Comparing numbers.
Example:

Ten Tips
thousands Thousands Hundreds Tens Ones • In ascending order, numbers are
arranged from the smallest value to the
3 7 6 9 1 largest value.
3 7 8 2 5 • In descending order, numbers are
arranged from the largest value to the
smallest value.
same 6 is smaller than 8
Compare the digits at hundreds because the digits at ten thousands and thousands are
the same. Thus, 37 691 is smaller than 37 825.

3. Even Numbers Odd Numbers
Numbers that have no remainder when Numbers that have a remainder when
divided by 2. divided by 2.
Any number that ends with 0, 2, 4, 6 or 8. Any number that ends with 1, 3, 5, 7 or 9.

4. Rounding off any number means giving the nearest value according to the desired place
value.
If the digit is 5 or more, add 1 to the
left of the digit. The digits after the
rounded off digit are replaced with 0
Identify the Observe the digit respectively.
desired place on the its right
value If the digit is less than 5, maintain the
digit on the left. The digits after the
rounded off digit are replaced with 0
respectively.
Info
Numbers and
operations

1 © Penerbitan Pelangi Sdn. Bhd.

01 Genius PBD Maths Yr4.indd 1 27/10/2022 11:33 AM