Matchsticks are composed of 1 1*2= 142 in primary school math problems. How to move two matches to make the equation hold?
Friend: It can be changed to 2 1*7= 147. First, take the lower stick in the second factor "2" in the original formula to become 7, then take the lower stick in the original digit "2" to get 147, and then move the two sticks to the tenth place of the first factor in the original formula.