Using distributive property find the product by expanding the multiplicand

Question

42×5

Answer 1

42x5 = 210

42x5 = (40+2)x5

= 40x5 + 5x2

= 200 +10

= 210

42x5 = 42x10/2 = 420/2 = 210

add digits in 42 to get 6

multiply 6 by 5 to get 30

3+0=3

210's digits sum to 3

digits in the problem = digits in the answer

or just use a calculator

punch in 42

then punch in x

punch in 5

punch on answer to get

210

if you get something different, your finger hit the wrong key(s)