Answer:
2800
Step-by-step explanation:
since 7 x 4 is 28 , 70 x 40 is 2800 because 70 is 7 x 10 and 40 is 4 x 10,
so 7 x 10 x 4 x 10 can be moved to get 7 x 4 x 10 x 10. if we do this we get 28 x 100 therefore 2800
Answer:
2800
Step-by-step explanation:
hear is a tip do the butterfly method
