Question

When using re-grouping to solve 21 x 43, what are the four products that would be calculated and then added?
800 + 3
80 + 40 + 60 + 3
800 + 40 + 60 + 3
800 + 40 + 6 + 3

Answer 1

Answer:

c

Step-by-step explanation:

21×43

=(20+1)×(40+3)

=800+40+60+3

Answer 2

The third one because 21 times 43 is 903 and 800 + 40 + 60 + 3 = 903