To compare the numbers for each part, we will use the symbols '<', '>', or '='. These symbols mean 'less than', 'greater than', and 'equal to', respectively.
a. 10 "> > 8
Here, 10 is greater than 8, so we use the '>' symbol.
b. 21 < 32
In this case, 21 is less than 32, so we use the '<' symbol.
c. 30 < 40
Here, 30 is less than 40, so we use the '<' symbol.
d. 81 = 81
Both numbers are the same, so they are equal, and we use the '=' symbol.
e. 9 < 10
In this case, 9 is less than 10, so we use the '<' symbol.
f. 21 (bars) < 23
The number of bars '|||||||||||||||||||||' represents 21. Since 21 is less than 23, we use the '<' symbol.
Comparing numbers is about determining which number is larger, smaller, or if they are equal. Using these comparison symbols in mathematics helps to organize and understand the relationships between numbers clearly.