I’ve answered your question in this link: yomemimo.com/tugas/51947782.
So, pseudocodes presented here are based on those flowcharts.

Here are the required pseudocodes.

Notes:

• You may substitute INPUT for READ, and OUTPUT for PRINT.
• Comment lines are started by # character.
• {var} means type-casting the var value into string.
• != means "doesn't equal to". You may change it to something else which is commonly used, like <>.

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Pseudocode #1
Using 4 additional variables for sum, difference, product, and quotient.

# Declaration
DECLARE a, b, sum, diff, prod, quot AS INTEGER
# User inputs two numbers.
READ a, b
# Process: calculate sum, diff, and prod.
sum ← a + b
diff ← a – b
prod ← a * b
# Output sum, diff, and prod.
PRINT ”{a} + {b} = {sum}“
PRINT ”{a} – {b} = {diff}“
PRINT ”{a} * {b} = {prod}“
# Calculate quotient
IF b != 0 THEN
   quot ← a / b
   PRINT ”{a} / {b} = {quot}“
ELSE
   PRINT ”{a} / {b} = undefined“
   # or raise a division-by-zero error exception

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Pseudocode #2
Using only one additional variable for storing all operation results.

# Declaration
DECLARE a, b, result AS INTEGER
# User inputs two numbers.
READ a, b
# Process each calculation, and then print the result.
result ← a + b
PRINT ”{a} + {b} = {result}“
result ← a – b
PRINT ”{a} – {b} = {result}“
result ← a * b
PRINT ”{a} * {b} = {result}“
# Calculate quotient
IF b != 0 THEN
   result ← a / b
   PRINT ”{a} / {b} = {result}“
ELSE
   PRINT ”{a} / {b} = undefined“
   # or raise a division-by-zero error exception