Answer:
Step-by-step explanation:
Greatest multiplier of 4 that is less than 21 is 5 (4 x 5 = 20)
Put the remaining number as the numerator (21 - 20 = 1)
b 17/18
Solve the one's in bracket then later solve everything together
c
21×43
=(20+1)×(40+3)
=800+40+60+3
