Final answer:
To find out how many crayons were lost or given away, subtract 134 from 479.
Step-by-step explanation:
To find out how many crayons were lost or given away, we need to subtract the number of crayons Praveen had at the end of the school year from the number of crayons he received for his birthday. This can be done using the subtraction operation. Starting with 479 crayons and subtracting 134 crayons, Praveen lost or gave away 345 crayons.
Learn more about Subtraction