Question

Explain using the basic fact can help you find 10×20×30×40 mentally

Answer 1

Multiply 20 by 10 first
Then 200 by 30 which is 6000
Then 6000 by 40 which is 240000

Basically just multiply the numbers that's aren't 0
Like 2 in 200 times 3 in 30
Which is 6 then add the 0s so 6+000=6000