Harder mental addition (One minute challenges)

Add a multiple of 1,000 to a 6-digit number. How many can you answer in a minute?

Add the decimal numbers together. How many can you answer in a minute?

Harder mental addition of 2 and 3-digit numbers. How many can you answer in a minute?

Add a multiple of 1,000 to a 6-digit number. How many can you answer in a minute?

Add a multiple of 10,000 to a 6-digit number. How many can you answer in a minute?

Add a multiple of 100,000 to a 6-digit number. How many can you answer in a minute?

Add two multiples of 1,000. How many can you answer in a minute?

Add two multiples of 10,000. How many can you answer in a minute?