Answer:
40 hundreds flats are equal to 400 tens rods.
Explanation:
Consider the provided information.
Mr Hernández' s class want to trade 400 tens rods for hundreds flats.
400 tens can be written as:
400 × 10 = 4000
Therefore, Mr Hernández' s class want to trade 4000 rods for hundreds flats.
Hundreds can be written as 100
We need to find how many hundreds flats are equal to 400 tens.
To find this simply divide the number 4000 with 100.

Therefore, 40 hundreds flats are equal to 400 tens rods.